| Year | Count |
|---|---|
| 1947 | 15 |
| 1948 | 5 |
| 1949 | 37 |
| 1950 | 58 |
| 1951 | 40 |
| 1952 | 18 |
| 1968 | 5 |
| 1969 | 15 |
| 1970 | 49 |
| 1971 | 16 |
| 1972 | 15 |
| 1973 | 24 |
| 1974 | 9 |
| 1975 | 15 |
| 1976 | 15 |
| 1977 | 5 |
| 1978 | 10 |
| 1979 | 6 |
| 1980 | 27 |
| 1981 | 21 |
| 1982 | 22 |
| 1983 | 10 |
| 1984 | 25 |
| 1985 | 46 |
| 1986 | 89 |
| 1987 | 108 |
| 1988 | 132 |
| 1989 | 126 |
| 1990 | 102 |
| 1991 | 105 |
| 1992 | 105 |
| 1993 | 53 |
| 1994 | 44 |
| 1995 | 5 |
| 1996 | 28 |
| 1997 | 11 |
| 1998 | 5 |
| 1999 | 5 |
| 2001 | 19 |