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Table representation of search results timeline featuring number of search results per year.
| Year | Number of Results |
|---|---|
| 1952 | 1 |
| 1965 | 1 |
| 1967 | 8 |
| 1969 | 2 |
| 1970 | 3 |
| 1971 | 3 |
| 1972 | 6 |
| 1973 | 1 |
| 1974 | 1 |
| 1975 | 2 |
| 1976 | 1 |
| 1978 | 1 |
| 1979 | 1 |
| 1981 | 1 |
| 1984 | 1 |
| 1987 | 2 |
| 1989 | 8 |
| 1990 | 1 |
| 1992 | 2 |
| 1993 | 1 |
| 1996 | 1 |
| 1998 | 1 |
| 2001 | 1 |
| 2007 | 1 |
| 2008 | 1 |
| 2009 | 2 |
| 2012 | 1 |
| 2016 | 3 |
| 2017 | 1 |
| 2025 | 0 |