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Table representation of search results timeline featuring number of search results per year.
Year
Number of Results
1945
14
1946
59
1947
38
1948
14
1949
28
1950
33
1951
112
1952
93
1953
118
1954
112
1955
121
1956
119
1957
90
1958
10
1959
55
1963
6
1964
31
1965
250
1966
526
1967
715
1968
777
1969
973
1970
968
1971
1106
1972
1265
1973
1264
1974
1396
1975
1187
1976
953
1977
915
1978
954
1979
943
1980
953
1981
906
1982
1055
1983
1030
1984
1125
1985
1228
1986
1296
1987
1248
1988
1311
1989
1492
1990
1468
1991
1446
1992
1421
1993
1415
1994
1425
1995
1295
1996
1349
1997
1339
1998
1207
1999
1099
2000
1137
2001
1143
2002
1162
2003
1337
2004
1245
2005
1369
2006
1581
2007
1605
2008
1490
2009
1552
2010
1761
2011
1848
2012
1934
2013
1898
2014
1804
2015
1921
2016
1867
2017
1856
2018
1868
2019
1818
2020
1743
2021
1296
2022
196
2023
45
2024
426
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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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