A moderator asked me for data on the percentage of questions closed across all sites. This doesn't strike me as information that needs to be restricted to moderators, so for your idle enjoyment I present:
Questions asked, closed and reopened for all sites in 2016
Site Name QuestionsAsked Closed PctClosed DuplicatesClosed DuplicatesReopened OTClosed OTReopened UnclearClosed UnclearReopened TooBroadClosed TooBroadReopened OpinionBasedClosed OpinionBasedReopened
-------------------------------------------------------- ------- --------- ---------------- ------------------ -------- ---------- ------------- --------------- -------------- ---------------- ------------------ --------------------
Stack Overflow 3201442 359737 11.24 % 129860 6292 99174 1500 50871 1138 66482 857 13350 160
Super User 71032 10141 14.28 % 1971 71 4823 65 1683 33 1283 15 381 9
Server Fault 39209 9951 25.38 % 1021 28 7284 114 873 26 606 14 167 3
Stack Apps 278 97 34.89 % 21 0 68 0 5 2 2 0 1 0
Cooking 2952 644 21.82 % 267 13 177 16 85 6 58 2 57 4
Home Improvement 8998 1043 11.59 % 131 4 569 16 240 15 65 4 38 0
Game Developers 9889 2409 24.36 % 235 10 1324 32 229 22 405 14 216 6
Gaming 17856 4723 26.45 % 1717 49 1551 80 963 65 279 20 213 20
GIS 23091 7020 30.40 % 1133 112 2227 219 1809 281 1691 283 160 18
Mathematics 219959 32778 14.90 % 6866 205 19302 622 5663 228 655 32 292 16
Photography 3306 921 27.86 % 377 4 331 4 109 2 54 0 50 2
Statistical Analysis 38578 8651 22.42 % 1183 45 4299 170 2503 332 581 27 85 5
Web Apps 5605 2263 40.37 % 290 4 1360 11 471 20 114 2 28 0
Webmasters 5852 2205 37.68 % 405 25 972 46 274 42 392 39 162 18
Apple 20048 3180 15.86 % 979 41 873 35 977 132 150 27 201 16
Theoretical Computer Science 1680 560 33.33 % 7 0 512 3 32 0 6 0 3 0
English Language and Usage 24178 13068 54.05 % 1949 55 8134 193 1552 58 378 22 1055 22
Personal Finance and Money 5246 1197 22.82 % 160 6 718 15 158 3 76 0 85 1
Role-playing Games 5127 1605 31.30 % 244 34 344 25 356 166 345 84 316 63
TeX - LaTeX 27881 5883 21.10 % 2438 99 1390 17 1868 42 109 6 78 6
Ubuntu 78381 16483 21.03 % 6545 110 5348 116 3318 129 715 17 557 6
Unix and Linux 35571 7233 20.33 % 1842 66 1743 43 2412 79 861 18 375 8
WordPress 19769 5475 27.69 % 280 10 4211 28 478 11 446 8 60 1
Bicycles 2299 502 21.84 % 158 1 190 6 83 2 40 1 31 0
Programmers 15030 6919 46.03 % 253 5 4109 35 1036 27 1037 19 484 19
Android Enthusiasts 15497 3989 25.74 % 714 13 2207 27 882 64 111 1 75 0
Board and Card Games 1535 310 20.20 % 126 2 64 4 46 9 34 2 40 8
Physics 34377 11570 33.66 % 2243 42 5770 48 2847 50 500 18 210 1
Homebrew 556 14 2.52 % 7 0 5 0 0 0 1 0 1 0
IT Security 14546 4477 30.78 % 783 8 2198 27 642 27 630 12 224 5
Writers 1310 411 31.37 % 40 0 262 9 46 2 39 4 24 1
Electronics and Robotics 28314 7842 27.70 % 665 9 3129 76 2337 77 1437 26 274 7
Graphic Design 7586 2286 30.13 % 461 9 1113 34 295 16 333 14 84 3
Database Administrators 16675 3396 20.37 % 463 29 1143 33 1218 112 463 23 109 7
Science Fiction & Fantasy 10705 2529 23.62 % 1385 103 428 61 140 29 248 49 328 50
Code Review 16396 5158 31.46 % 51 6 4561 389 499 111 24 1 23 0
Code Golf 3114 1352 43.42 % 296 60 513 34 422 154 114 14 7 2
Quantitative Finance 3120 448 14.36 % 28 0 281 8 85 2 39 2 15 0
Project Management 846 213 25.18 % 5 0 104 0 28 2 40 0 36 1
Skeptics 1670 748 44.79 % 102 7 388 56 157 61 24 6 77 13
Drupal Answers 20417 3393 16.62 % 530 27 1043 45 774 57 924 32 122 6
Fitness and Nutrition 1270 561 44.17 % 107 1 273 4 23 0 57 3 101 1
Motor Vehicle Maintenance and Repair 4894 616 12.59 % 131 4 145 12 128 8 157 2 55 4
Parenting 996 299 30.02 % 38 1 154 4 63 9 23 0 21 1
SharePoint 17049 955 5.60 % 221 11 303 23 234 54 138 17 59 6
Musical Practice and Performance 3121 882 28.26 % 110 7 438 8 122 8 108 3 104 4
Software Quality Assurance and Testing 2215 725 32.73 % 60 0 142 0 242 1 166 1 115 1
Jewish Life and Learning 4095 1146 27.99 % 413 27 374 30 239 42 74 12 46 3
Astronomy 1869 448 23.97 % 114 1 148 9 121 7 34 2 31 1
German Language and Usage 2088 557 26.68 % 113 2 310 22 77 9 35 1 22 3
Japanese Language and Usage 3503 602 17.19 % 162 5 371 18 38 2 18 2 13 2
Gardening and Landscaping 2121 204 9.62 % 55 0 54 8 58 5 31 0 6 0
Philosophy 2697 943 34.96 % 55 2 421 26 242 16 119 10 106 3
Personal Productivity 382 174 45.55 % 26 0 75 0 23 1 34 0 16 1
Travel 8018 3379 42.14 % 1286 55 966 91 573 70 245 18 309 37
Cryptography 4656 1454 31.23 % 259 24 859 44 202 28 103 11 31 7
Signal Processing 3890 827 21.26 % 78 1 279 18 317 72 137 14 16 2
French Language and Usage 1859 227 12.21 % 73 3 113 5 19 1 14 0 8 1
Christianity 2324 1755 75.52 % 139 5 443 26 265 6 284 19 624 28
Bitcoin 2766 564 20.39 % 250 12 147 3 109 7 30 1 28 2
Linguistics 1397 374 26.77 % 22 1 211 9 75 0 42 0 24 0
Biblical Hermeneutics 1268 415 32.73 % 76 1 217 25 66 5 20 2 36 3
Economics 2551 572 22.42 % 26 0 375 2 102 1 51 1 18 1
History 1977 717 36.27 % 37 0 331 13 136 11 99 7 114 1
LEGO® 456 87 19.08 % 30 1 27 1 21 1 7 0 2 0
Spanish Language and Usage 1141 151 13.23 % 37 0 79 3 11 1 11 0 13 0
Computational Science 1725 342 19.83 % 18 1 214 1 73 3 28 0 9 1
Movies 7328 2506 34.20 % 235 6 1927 67 96 7 102 12 146 15
Chinese Language and Usage 966 179 18.53 % 18 0 124 4 11 1 18 2 8 0
Biology 5687 1919 33.74 % 153 0 744 13 506 6 297 1 219 2
Poker 290 79 27.24 % 46 0 11 0 7 0 9 1 6 1
Mathematica 13642 4526 33.18 % 1072 29 2877 69 478 30 84 6 15 2
Cognitive Sciences 1345 521 38.74 % 22 0 201 5 115 0 117 2 66 1
The Great Outdoors 891 142 15.94 % 25 2 61 15 11 4 30 6 15 5
Martial Arts 271 62 22.88 % 15 0 17 0 5 0 16 1 9 0
Sports 1004 316 31.47 % 40 2 111 8 30 4 49 3 86 4
Academia 7402 2952 39.88 % 531 24 1784 57 378 30 178 10 81 10
Computer Science 7972 2444 30.66 % 373 19 950 14 836 43 186 8 99 0
The Workplace 6262 3039 48.53 % 541 4 1749 53 298 16 201 8 250 9
Windows Phone 788 143 18.15 % 65 0 49 3 19 2 1 0 9 0
Chemistry 10428 3805 36.49 % 484 18 2225 83 694 34 344 14 58 2
Chess 814 107 13.14 % 39 1 21 0 17 0 16 0 14 1
Raspberry Pi 8218 1515 18.44 % 372 27 523 21 298 62 268 17 54 4
Russian Language and Usage 633 93 14.69 % 10 0 63 8 10 2 9 2 1 0
Islam 2210 424 19.19 % 101 0 100 0 118 2 35 0 70 0
Salesforce 23051 3387 14.69 % 503 19 1616 75 722 40 468 15 78 2
Patents 1121 436 38.89 % 79 0 316 5 35 3 5 1 1 0
User Experience 4699 1328 28.26 % 113 1 544 10 106 8 270 7 295 9
Genealogy and Family History 467 97 20.77 % 39 2 15 0 26 6 15 4 2 0
Robotics 1173 476 40.58 % 26 0 159 15 121 13 67 2 103 3
ExpressionEngine 1380 23 1.67 % 2 0 13 1 5 0 3 0 0 0
Politics 1747 554 31.71 % 63 3 105 6 107 9 88 3 191 17
Audio-Video Production 1415 146 10.32 % 17 0 80 0 15 1 25 0 9 0
Anime and Manga 3371 3109 92.23 % 121 4 2739 31 100 15 59 8 90 5
Magento 27444 2966 10.81 % 735 14 1336 17 453 23 315 7 127 0
English Language Learners 13102 2709 20.68 % 625 26 1594 128 210 23 151 9 129 13
Sustainable Living 260 44 16.92 % 8 0 14 2 9 1 9 0 4 0
Tridion 1176 23 1.96 % 11 1 5 1 3 0 4 0 0 0
Reverse Engineering 1364 338 24.78 % 30 0 149 1 114 2 39 1 6 0
Arduino 5759 802 13.93 % 92 1 247 9 280 3 157 3 26 0
Network Engineering 5373 2241 41.71 % 88 1 1933 22 53 7 134 3 33 3
Open Data 1268 75 5.91 % 27 2 28 1 14 1 5 0 1 0
Freelancing 433 118 27.25 % 8 0 53 0 5 0 29 2 23 0
Blender 12187 1504 12.34 % 871 24 261 9 224 21 107 6 41 2
MathOverflow 16748 4162 24.85 % 78 4 3431 77 535 30 74 3 44 5
Space Exploration 1972 451 22.87 % 116 11 113 10 77 12 90 8 55 8
Sound Design 1060 207 19.53 % 16 0 154 4 8 1 14 0 15 2
Tor 1523 517 33.95 % 216 2 63 0 195 4 30 1 13 0
Pets 986 127 12.88 % 64 1 38 1 7 2 10 0 8 0
Amateur Radio 484 85 17.56 % 7 1 53 5 8 2 12 3 5 0
Italian Language 532 36 6.77 % 6 1 23 3 4 0 1 0 2 0
Stack Overflow em Português 32171 6816 21.19 % 1168 46 1840 73 2557 128 970 27 281 9
Aviation 3227 872 27.02 % 286 30 225 34 154 35 151 28 56 8
Ebooks 248 46 18.55 % 1 0 36 0 5 0 3 0 1 0
Beer 192 31 16.15 % 3 0 11 0 5 0 7 1 5 1
Software Recommendations 4785 778 16.26 % 45 0 345 21 266 49 102 18 20 0
Expatriates 1167 171 14.65 % 37 1 44 0 43 4 26 0 21 0
Mathematics Educators 440 84 19.09 % 3 0 62 0 9 1 8 1 2 0
Earth Science 956 180 18.83 % 23 0 70 4 57 4 24 1 6 0
Joomla 1721 222 12.90 % 35 0 67 0 32 3 81 2 7 0
Data Science 3248 572 17.61 % 12 0 198 1 176 17 129 3 57 0
Puzzling 4869 852 17.50 % 203 10 286 32 114 17 237 29 12 0
Craft CMS 2523 130 5.15 % 45 0 69 2 2 1 14 0 0 0
Buddhism 936 69 7.37 % 22 2 24 4 8 4 5 3 10 2
Hinduism 2203 508 23.06 % 260 11 126 17 45 5 26 3 51 9
Moderators 90 17 18.89 % 1 0 10 0 2 0 4 0 0 0
Startups 1008 192 19.05 % 14 0 85 0 22 0 55 0 16 0
Worldbuilding 5849 1793 30.65 % 164 5 525 46 214 16 571 51 319 24
スタック・オーバーフロー 5076 206 4.06 % 33 3 51 5 65 7 39 4 18 0
Emacs 4202 164 3.90 % 92 0 20 2 22 2 18 1 12 0
History of Science and Mathematics 552 58 10.51 % 16 1 29 1 9 0 2 0 2 0
Lifehacks 804 349 43.41 % 31 2 297 2 13 1 7 0 1 0
Engineering 2710 911 33.62 % 35 4 244 11 338 25 266 8 28 3
Coffee 256 30 11.72 % 12 0 6 0 4 0 5 0 3 0
Vi and Vim 2038 186 9.13 % 84 7 54 2 17 4 22 2 9 1
Music Fans 787 129 16.39 % 5 0 52 0 13 0 23 0 36 0
Woodworking 683 87 12.74 % 20 1 27 4 12 2 19 4 9 0
CiviCRM 3101 67 2.16 % 39 0 8 0 15 1 4 1 1 0
Health 2418 578 23.90 % 20 0 436 12 40 1 49 2 33 1
Stack Overflow на русском 63634 9137 14.36 % 1283 35 2800 107 2030 108 1393 61 1631 32
Русский язык 1988 203 10.21 % 13 0 140 4 27 1 11 0 12 0
Mythology 361 37 10.25 % 1 0 9 0 14 4 10 3 3 1
Law 3752 463 12.34 % 51 1 209 13 106 11 58 3 39 2
Open Source 691 155 22.43 % 26 0 86 9 16 2 15 3 12 3
elementary OS 2450 518 21.14 % 210 4 241 4 45 0 11 0 11 1
Portuguese Language 470 31 6.60 % 11 1 11 1 4 1 4 0 1 0
Computer Graphics 791 153 19.34 % 3 1 90 5 39 3 19 0 2 0
Hardware Recommendations 1676 961 57.34 % 7 1 783 48 36 8 90 10 45 3
Stack Overflow en español 16154 3229 19.99 % 225 13 618 101 1124 184 892 114 370 33
Documentation Beta 757 31 4.10 % 24 0 4 0 3 1 0 0 0 0
3D Printing 767 113 14.73 % 6 0 40 1 15 4 31 2 21 6
Ethereum 4309 648 15.04 % 360 34 85 8 78 15 65 9 60 10
Latin Language 854 28 3.28 % 7 1 4 0 5 2 10 4 2 0
Language Learning 478 152 31.80 % 11 1 39 7 17 7 40 14 45 22
Retrocomputing 509 51 10.02 % 4 0 20 0 6 3 17 2 4 2
Arts & Crafts 535 75 14.02 % 3 0 40 3 6 0 18 4 8 2
Korean Language 407 15 3.69 % 3 0 6 2 1 1 4 2 1 1
Monero 1065 116 10.89 % 42 2 11 1 8 0 25 5 30 2
Artificial Intelligence 581 148 25.47 % 6 0 88 9 13 1 26 2 15 2
Esperanto Language 749 26 3.47 % 10 1 5 0 1 0 6 3 4 0
Sitecore 1273 101 7.93 % 17 2 49 2 9 0 18 2 8 2
Internet of Things 149 37 24.83 % 1 0 10 1 7 3 16 3 3 2
Caveats:
- this counts questions asked in 2016 and questions closed in 2016 - it does NOT ensure that the questions closed were also asked in 2016 (so big cleanup efforts will skew the %). See answer for stats on questions asked and closed in 2016..
- if a question was closed twice, it'll be counted twice
- if a question was reopened twice, it'll be counted twice