| Year | Count |
|---|---|
| 1946 | 5 |
| 1947 | 6 |
| 1948 | 7 |
| 1949 | 5 |
| 1950 | 19 |
| 1951 | 31 |
| 1952 | 32 |
| 1953 | 6 |
| 1954 | 5 |
| 1955 | 12 |
| 1958 | 6 |
| 1959 | 12 |
| 1960 | 22 |
| 1961 | 5 |
| 1962 | 12 |
| 1963 | 22 |
| 1964 | 43 |
| 1965 | 67 |
| 1966 | 40 |
| 1967 | 75 |
| 1968 | 54 |
| 1969 | 67 |
| 1970 | 78 |
| 1971 | 42 |
| 1972 | 58 |
| 1973 | 42 |
| 1974 | 41 |
| 1975 | 27 |
| 1976 | 12 |
| 1977 | 35 |
| 1978 | 42 |
| 1979 | 20 |
| 1980 | 5 |
| 1981 | 45 |
| 1982 | 35 |
| 1983 | 21 |
| 1984 | 29 |
| 1985 | 28 |
| 1986 | 24 |
| 1987 | 31 |
| 1988 | 35 |
| 1989 | 46 |
| 1990 | 70 |
| 1991 | 79 |
| 1992 | 27 |
| 1993 | 5 |
| 1994 | 28 |
| 1995 | 6 |
| 1996 | 15 |
| 1997 | 7 |
| 1998 | 5 |
| 2000 | 5 |
| 2003 | 5 |
| 2004 | 24 |