Yearly Citation Totals from 2013 MEDLINE/PubMed Baseline: 21,508,439 Citations Found
| Year | Number of Citations |
| 1809 | 22 |
| 1811 | 33 |
| 1812 | 24 |
| 1813 | 27 |
| 1814 | 29 |
| 1815 | 29 |
| 1816 | 43 |
| 1817 | 25 |
| 1818 | 33 |
| 1819 | 31 |
| 1821 | 35 |
| 1823 | 51 |
| 1827 | 46 |
| 1828 | 14 |
| 1829 | 14 |
| 1831 | 21 |
| 1832 | 17 |
| 1833 | 13 |
| 1835 | 21 |
| 1837 | 18 |
| 1838 | 25 |
| 1839 | 24 |
| 1840 | 146 |
| 1841 | 526 |
| 1842 | 662 |
| 1843 | 564 |
| 1844 | 339 |
| 1845 | 280 |
| 1846 | 279 |
| 1847 | 241 |
| 1848 | 245 |
| 1849 | 211 |
| 1850 | 215 |
| 1851 | 233 |
| 1852 | 237 |
| 1853 | 230 |
| 1854 | 140 |
| 1855 | 178 |
| 1856 | 249 |
| 1857 | 257 |
| 1858 | 235 |
| 1859 | 223 |
| 1860 | 169 |
| 1861 | 202 |
| 1862 | 191 |
| 1863 | 169 |
| 1864 | 159 |
| 1865 | 134 |
| 1866 | 144 |
| 1867 | 366 |
| 1868 | 513 |
| 1869 | 423 |
| 1870 | 428 |
| 1871 | 489 |
| 1872 | 494 |
| 1873 | 546 |
| 1874 | 427 |
| 1875 | 441 |
| 1876 | 451 |
| 1877 | 395 |
| 1878 | 485 |
| 1879 | 504 |
| 1880 | 784 |
| 1881 | 922 |
| 1882 | 479 |
| 1883 | 1141 |
| 1884 | 1345 |
| 1885 | 1427 |
| 1886 | 1463 |
| 1887 | 1418 |
| 1888 | 1167 |
| 1889 | 1506 |
| 1890 | 1041 |
| 1891 | 894 |
| 1892 | 1367 |
| 1893 | 1642 |
| 1894 | 1125 |
| 1895 | 1491 |
| 1896 | 1794 |
| 1897 | 1791 |
| 1898 | 1773 |
| 1899 | 1475 |
| 1900 | 1418 |
| 1901 | 1628 |
| 1902 | 1725 |
| 1903 | 1945 |
| 1904 | 1899 |
| 1905 | 2115 |
| 1906 | 2069 |
| 1907 | 2058 |
| 1908 | 2694 |
| 1909 | 2956 |
| 1910 | 3014 |
| 1911 | 3333 |
| 1912 | 3312 |
| 1913 | 3535 |
| 1914 | 3531 |
| 1915 | 3325 |
| 1916 | 3134 |
| 1917 | 2890 |
| 1918 | 2856 |
| 1919 | 3089 |
| 1920 | 3297 |
| 1921 | 3329 |
| 1922 | 3472 |
| 1923 | 3761 |
| 1924 | 4160 |
| 1925 | 4393 |
| 1926 | 4693 |
| 1927 | 5298 |
| 1928 | 4922 |
| 1929 | 5010 |
| 1930 | 4905 |
| 1931 | 4828 |
| 1932 | 5013 |
| 1933 | 5020 |
| 1934 | 4988 |
| 1935 | 5090 |
| 1936 | 4824 |
| 1937 | 4797 |
| 1938 | 5249 |
| 1939 | 5046 |
| 1940 | 4520 |
| 1941 | 4331 |
| 1942 | 4259 |
| 1943 | 4184 |
| 1944 | 4374 |
| 1945 | 20190 |
| 1946 | 53788 |
| 1947 | 64741 |
| 1948 | 70458 |
| 1949 | 61567 |
| 1950 | 82264 |
| 1951 | 102081 |
| 1952 | 107427 |
| 1953 | 107980 |
| 1954 | 105134 |
| 1955 | 108032 |
| 1956 | 106501 |
| 1957 | 111041 |
| 1958 | 108888 |
| 1959 | 109405 |
| 1960 | 111518 |
| 1961 | 119531 |
| 1962 | 125325 |
| 1963 | 141051 |
| 1964 | 161477 |
| 1965 | 176601 |
| 1966 | 179505 |
| 1967 | 191454 |
| 1968 | 207405 |
| 1969 | 214347 |
| 1970 | 218077 |
| 1971 | 222366 |
| 1972 | 226418 |
| 1973 | 230429 |
| 1974 | 234205 |
| 1975 | 247838 |
| 1976 | 253594 |
| 1977 | 260444 |
| 1978 | 270737 |
| 1979 | 279778 |
| 1980 | 278226 |
| 1981 | 280793 |
| 1982 | 292479 |
| 1983 | 306379 |
| 1984 | 314941 |
| 1985 | 324983 |
| 1986 | 338475 |
| 1987 | 355852 |
| 1988 | 373810 |
| 1989 | 389392 |
| 1990 | 396536 |
| 1991 | 397471 |
| 1992 | 401624 |
| 1993 | 407767 |
| 1994 | 418258 |
| 1995 | 428077 |
| 1996 | 432429 |
| 1997 | 444672 |
| 1998 | 458626 |
| 1999 | 472274 |
| 2000 | 499074 |
| 2001 | 529911 |
| 2002 | 550388 |
| 2003 | 577415 |
| 2004 | 613006 |
| 2005 | 649501 |
| 2006 | 677167 |
| 2007 | 700524 |
| 2008 | 736837 |
| 2009 | 764441 |
| 2010 | 793461 |
| 2011 | 825639 |
| 2012 | 480631 |
| 2013 | 34 |
Last Reviewed: April 22, 2015