| Year | Count |
|---|---|
| 1926 | 10 |
| 1949 | 6 |
| 1952 | 16 |
| 1958 | 5 |
| 1961 | 5 |
| 1962 | 18 |
| 1964 | 6 |
| 1965 | 8 |
| 1966 | 19 |
| 1967 | 12 |
| 1968 | 10 |
| 1969 | 8 |
| 1970 | 33 |
| 1971 | 23 |
| 1972 | 20 |
| 1973 | 36 |
| 1974 | 5 |
| 1974 | 5 |
| 1975 | 13 |
| 1976 | 18 |
| 1977 | 19 |
| 1978 | 26 |
| 1979 | 31 |
| 1980 | 39 |
| 1981 | 12 |
| 1982 | 41 |
| 1983 | 57 |
| 1984 | 67 |
| 1985 | 34 |
| 1986 | 10 |
| 1987 | 27 |
| 1988 | 25 |
| 1989 | 23 |
| 1990 | 15 |
| 1991 | 11 |
| 1992 | 22 |
| 1993 | 12 |
| 1996 | 6 |
| 1997 | 5 |
| 1998 | 5 |
| 1999 | 7 |
| 2001 | 5 |
| 2004 | 7 |
| 2008 | 14 |
| 2009 | 10 |
| 2014 | 5 |
| 2019 | 5 |