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Table representation of search results timeline featuring number of search results per year.
Year
Number of Results
1992
14
1993
18
1994
40
1995
49
1996
59
1997
49
1998
77
1999
63
2000
69
2001
71
2002
55
2003
76
2004
52
2005
78
2006
86
2007
88
2008
88
2009
95
2010
107
2011
82
2012
137
2013
132
2014
145
2015
130
2016
136
2017
136
2018
130
2019
135
2020
113
2021
107
2022
65
2023
37
2024
113
2025
1
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ARTICLE TYPE
Adaptive Clinical Trial
Address
Autobiography
Bibliography
Biography
Books and Documents
Case Reports
Classical Article
Clinical Conference
Clinical Study
Clinical Trial
Clinical Trial Protocol
Clinical Trial, Phase I
Clinical Trial, Phase II
Clinical Trial, Phase III
Clinical Trial, Phase IV
Clinical Trial, Veterinary
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Comparative Study
Congress
Consensus Development Conference
Consensus Development Conference, NIH
Controlled Clinical Trial
Corrected and Republished Article
Dataset
Dictionary
Directory
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Equivalence Trial
Evaluation Study
Expression of Concern
Festschrift
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Guideline
Historical Article
Interactive Tutorial
Interview
Introductory Journal Article
Lecture
Legal Case
Legislation
Letter
Meta-Analysis
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
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
Review
Scientific Integrity Review
Systematic Review
Technical Report
Twin Study
Validation Study
Video-Audio Media
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