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Table representation of search results timeline featuring number of search results per year.
| Year | Number of Results |
|---|---|
| 1858 | 1 |
| 1929 | 1 |
| 1949 | 1 |
| 1954 | 1 |
| 1956 | 1 |
| 1957 | 1 |
| 1958 | 2 |
| 1959 | 1 |
| 1961 | 3 |
| 1963 | 1 |
| 1964 | 1 |
| 1966 | 1 |
| 1969 | 1 |
| 1972 | 2 |
| 1973 | 2 |
| 1974 | 1 |
| 1978 | 1 |
| 1981 | 1 |
| 1982 | 2 |
| 1988 | 1 |
| 1991 | 1 |
| 1994 | 1 |
| 1998 | 1 |
| 2003 | 1 |
| 2005 | 1 |
| 2006 | 4 |
| 2007 | 1 |
| 2008 | 1 |
| 2009 | 1 |
| 2010 | 7 |
| 2011 | 3 |
| 2012 | 2 |
| 2013 | 5 |
| 2014 | 6 |
| 2015 | 3 |
| 2016 | 4 |
| 2017 | 2 |
| 2018 | 8 |
| 2019 | 8 |
| 2020 | 7 |
| 2021 | 10 |
| 2022 | 9 |