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Table representation of search results timeline featuring number of search results per year.
Year
Number of Results
1985
179
1986
489
1987
443
1988
519
1989
535
1990
496
1991
481
1992
650
1993
676
1994
555
1995
497
1996
544
1997
560
1998
532
1999
557
2000
566
2001
582
2002
676
2003
593
2004
586
2005
602
2006
544
2007
566
2008
529
2009
608
2010
741
2011
754
2012
643
2013
674
2014
674
2015
636
2016
549
2017
656
2018
612
2019
562
2020
562
2021
605
2022
344
2023
474
2024
361
2025
412
2026
313
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ARTICLE TYPE
Adaptive Clinical Trial
Address
Biography
Books and Documents
Case Reports
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
Collected Work
Comment
Comparative Study
Conference Proceedings
Consensus Statement
Controlled Clinical Trial
Corrected and Republished Article
Dataset
Duplicate Publication
Editorial
Electronic Supplementary Materials
English Abstract
Equivalence Trial
Evaluation Study
Evidence Synthesis
Expression of Concern
Festschrift
Guideline
Historical Article
Interview
Introductory Journal Article
Lecture
Letter
Meta-Analysis
Multicenter Study
Network Meta-Analysis
News
Observational Study
Observational Study, Veterinary
Patient Education Handout
Personal Narrative
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 Notice
Review
Scoping Review
Systematic Review
Twin Study
Validation Study
Video-Audio Media
Webcast
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