| Year | Count |
|---|---|
| 1944 | 10 |
| 1947 | 15 |
| 1950 | 5 |
| 1951 | 11 |
| 1954 | 10 |
| 1955 | 8 |
| 1956 | 15 |
| 1957 | 16 |
| 1958 | 11 |
| 1959 | 30 |
| 1960 | 17 |
| 1961 | 113 |
| 1962 | 39 |
| 1963 | 239 |
| 1964 | 184 |
| 1965 | 110 |
| 1966 | 72 |
| 1967 | 79 |
| 1968 | 68 |
| 1969 | 43 |
| 1970 | 105 |
| 1971 | 120 |
| 1972 | 78 |
| 1973 | 17 |
| 1974 | 47 |
| 1975 | 64 |
| 1976 | 5 |
| 1977 | 35 |
| 1978 | 14 |
| 1979 | 48 |
| 1980 | 37 |
| 1981 | 50 |
| 1982 | 41 |
| 1983 | 28 |
| 1984 | 39 |
| 1985 | 31 |
| 1986 | 40 |
| 1987 | 13 |
| 1988 | 39 |
| 1989 | 40 |
| 1990 | 17 |
| 1991 | 15 |
| 1992 | 11 |
| 1993 | 19 |
| 1994 | 34 |
| 1995 | 10 |
| 1996 | 17 |
| 1997 | 5 |
| 1999 | 5 |
| 2000 | 5 |
| 2003 | 5 |
| 2004 | 10 |