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Table representation of search results timeline featuring number of search results per year.
Year
Number of Results
1972
3
1973
1
1974
7
1975
2
1976
4
1977
4
1978
5
1979
5
1980
2
1981
5
1982
3
1983
12
1984
14
1985
13
1986
12
1987
14
1988
8
1989
18
1990
18
1991
12
1992
8
1993
5
1994
6
1995
14
1996
9
1997
5
1998
6
1999
9
2000
11
2001
7
2002
8
2003
9
2004
10
2005
14
2006
15
2007
23
2008
21
2009
22
2010
21
2011
33
2012
30
2013
34
2014
29
2015
30
2016
40
2017
35
2018
42
2019
40
2020
53
2021
88
2022
69
2023
76
2024
39
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MLA
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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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