Table representation of search results timeline featuring number of search results per year.
| Year | Number of Results |
|---|---|
| 1868 | 1 |
| 1878 | 1 |
| 1880 | 5 |
| 1881 | 3 |
| 1883 | 3 |
| 1884 | 1 |
| 1885 | 1 |
| 1890 | 1 |
| 1898 | 1 |
| 1902 | 1 |
| 1907 | 1 |
| 1911 | 1 |
| 1912 | 1 |
| 1917 | 1 |
| 1918 | 1 |
| 1921 | 1 |
| 1925 | 1 |
| 1927 | 1 |
| 1929 | 1 |
| 1930 | 1 |
| 1931 | 1 |
| 1932 | 2 |
| 1933 | 2 |
| 1935 | 3 |
| 1936 | 4 |
| 1937 | 2 |
| 1938 | 1 |
| 1940 | 1 |
| 1941 | 1 |
| 1943 | 4 |
| 1944 | 2 |
| 1945 | 5 |
| 1946 | 18 |
| 1947 | 21 |
| 1948 | 23 |
| 1949 | 9 |
| 1950 | 22 |
| 1951 | 22 |
| 1952 | 32 |
| 1953 | 15 |
| 1954 | 20 |
| 1955 | 25 |
| 1956 | 27 |
| 1957 | 25 |
| 1958 | 38 |
| 1959 | 37 |
| 1960 | 28 |
| 1961 | 36 |
| 1962 | 49 |
| 1963 | 51 |
| 1964 | 48 |
| 1965 | 61 |
| 1966 | 62 |
| 1967 | 47 |
| 1968 | 55 |
| 1969 | 53 |
| 1970 | 65 |
| 1971 | 85 |
| 1972 | 75 |
| 1973 | 69 |
| 1974 | 95 |
| 1975 | 129 |
| 1976 | 102 |
| 1977 | 112 |
| 1978 | 121 |
| 1979 | 169 |
| 1980 | 143 |
| 1981 | 193 |
| 1982 | 232 |
| 1983 | 181 |
| 1984 | 178 |
| 1985 | 163 |
| 1986 | 176 |
| 1987 | 177 |
| 1988 | 212 |
| 1989 | 183 |
| 1990 | 210 |
| 1991 | 186 |
| 1992 | 189 |
| 1993 | 187 |
| 1994 | 178 |
| 1995 | 210 |
| 1996 | 197 |
| 1997 | 190 |
| 1998 | 224 |
| 1999 | 225 |
| 2000 | 235 |
| 2001 | 217 |
| 2002 | 224 |
| 2003 | 208 |
| 2004 | 196 |
| 2005 | 241 |
| 2006 | 251 |
| 2007 | 268 |
| 2008 | 255 |
| 2009 | 278 |
| 2010 | 265 |
| 2011 | 250 |
| 2012 | 291 |
| 2013 | 301 |
| 2014 | 312 |
| 2015 | 333 |
| 2016 | 378 |
| 2017 | 337 |
| 2018 | 341 |
| 2019 | 384 |
| 2020 | 412 |
| 2021 | 180 |