| Year | Count |
|---|---|
| 1963 | 6 |
| 1964 | 5 |
| 1965 | 7 |
| 1967 | 5 |
| 1968 | 50 |
| 1969 | 17 |
| 1970 | 38 |
| 1971 | 36 |
| 1972 | 28 |
| 1974 | 5 |
| 1975 | 27 |
| 1976 | 10 |
| 1977 | 92 |
| 1978 | 671 |
| 1979 | 482 |
| 1980 | 367 |
| 1981 | 204 |
| 1982 | 81 |
| 1983 | 76 |
| 1984 | 57 |
| 1985 | 55 |
| 1986 | 41 |
| 1987 | 22 |
| 1988 | 8 |
| 1991 | 34 |
| 1993 | 24 |
| 1998 | 5 |
| 2007 | 5 |
| 2011 | 6 |
| 2012 | 10 |
| 2013 | 5 |
| 2014 | 19 |
| 2015 | 10 |
| 2020 | 20 |
| 2022 | 6 |