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Table representation of search results timeline featuring number of search results per year.
Year
Number of Results
1966
3
1967
8
1968
14
1969
9
1970
18
1971
18
1972
17
1973
15
1974
20
1975
26
1976
18
1977
11
1978
24
1979
29
1980
18
1981
26
1982
21
1983
24
1984
29
1985
18
1986
18
1987
23
1988
16
1989
22
1990
12
1991
15
1992
14
1993
15
1994
12
1995
8
1996
14
1997
15
1998
20
1999
12
2000
16
2001
11
2002
19
2003
16
2004
13
2005
6
2006
17
2007
11
2008
10
2009
11
2010
17
2011
18
2012
7
2013
11
2014
6
2015
5
2016
4
2017
3
2018
2
2019
6
2020
3
2021
2
2024
0
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APA
MLA
NLM
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AMA
APA
MLA
NLM
Adaptive Clinical Trial
Address
Autobiography
Bibliography
Biography
Case Reports
Classical Article
Clinical Conference
Clinical Study
Clinical Trial Protocol
Clinical Trial, Phase I
Clinical Trial, Phase II
Clinical Trial, Phase III
Clinical Trial, Phase IV
Clinical Trial, Veterinary
Collected Work
Comment
Comparative Study
Congress
Consensus Development Conference
Consensus Development Conference, NIH
Controlled Clinical Trial
Corrected and Republished Article
Dataset
Dictionary
Directory
Duplicate Publication
Editorial
Electronic Supplementary Materials
English Abstract
Equivalence Trial
Evaluation Study
Expression of Concern
Festschrift
Government Publication
Guideline
Historical Article
Interactive Tutorial
Interview
Introductory Journal Article
Lecture
Legal Case
Legislation
Letter
Multicenter Study
News
Newspaper Article
Observational Study
Observational Study, Veterinary
Overall
Patient Education Handout
Periodical Index
Personal Narrative
Portrait
Practice Guideline
Pragmatic Clinical Trial
Preprint
Published Erratum
Randomized Controlled Trial, Veterinary
Research Support, American Recovery and Reinvestment Act
Research Support, N.I.H., Extramural
Research Support, N.I.H., Intramural
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Research Support, U.S. Gov't, P.H.S.
Research Support, U.S. Gov't
Retracted Publication
Retraction of Publication
Scientific Integrity Review
Technical Report
Twin Study
Validation Study
Video-Audio Media
Webcast
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