| Year | Count |
|---|---|
| 1954 | 21 |
| 1955 | 29 |
| 1956 | 6 |
| 1957 | 15 |
| 1958 | 15 |
| 1959 | 23 |
| 1960 | 5 |
| 1961 | 15 |
| 1964 | 15 |
| 1966 | 5 |
| 1971 | 10 |
| 1975 | 5 |
| 1977 | 8 |
| 1978 | 9 |
| 1979 | 19 |
| 1980 | 7 |
| 1981 | 15 |
| 1982 | 6 |
| 1983 | 9 |
| 1984 | 6 |
| 1985 | 5 |
| 1986 | 31 |
| 1987 | 44 |
| 1988 | 58 |
| 1989 | 33 |
| 1990 | 48 |
| 1991 | 67 |
| 1992 | 20 |
| 1993 | 27 |
| 1994 | 9 |
| 1995 | 19 |
| 1996 | 8 |
| 1997 | 28 |
| 1998 | 37 |
| 1999 | 17 |
| 2000 | 10 |
| 2003 | 10 |
| 2004 | 12 |
| 2007 | 5 |