| Year | Count |
|---|---|
| 1955 | 10 |
| 1957 | 17 |
| 1958 | 26 |
| 1959 | 7 |
| 1960 | 35 |
| 1961 | 18 |
| 1962 | 61 |
| 1963 | 13 |
| 1964 | 78 |
| 1965 | 68 |
| 1966 | 69 |
| 1967 | 131 |
| 1968 | 90 |
| 1969 | 90 |
| 1970 | 75 |
| 1971 | 83 |
| 1972 | 39 |
| 1973 | 51 |
| 1974 | 45 |
| 1975 | 17 |
| 1976 | 12 |
| 1977 | 6 |
| 1978 | 26 |
| 1979 | 11 |
| 1980 | 20 |
| 1981 | 22 |
| 1982 | 26 |
| 1983 | 6 |
| 1984 | 6 |
| 1985 | 24 |
| 1986 | 22 |
| 1987 | 10 |
| 1988 | 10 |
| 1989 | 7 |
| 1991 | 10 |
| 1996 | 8 |
| 1997 | 5 |
| 2001 | 5 |
| 2003 | 10 |
| 2004 | 24 |
| 2005 | 16 |
| 2006 | 14 |
| 2007 | 16 |
| 2008 | 17 |
| 2010 | 5 |
| 2020 | 5 |