| Year | Count |
|---|---|
| 1952 | 5 |
| 1954 | 15 |
| 1955 | 5 |
| 1956 | 29 |
| 1957 | 27 |
| 1958 | 22 |
| 1959 | 44 |
| 1960 | 47 |
| 1961 | 30 |
| 1962 | 12 |
| 1963 | 23 |
| 1964 | 40 |
| 1965 | 37 |
| 1966 | 21 |
| 1967 | 73 |
| 1968 | 94 |
| 1969 | 140 |
| 1970 | 211 |
| 1971 | 274 |
| 1972 | 266 |
| 1973 | 260 |
| 1974 | 322 |
| 1975 | 357 |
| 1976 | 325 |
| 1977 | 359 |
| 1978 | 431 |
| 1979 | 390 |
| 1980 | 238 |
| 1981 | 353 |
| 1982 | 195 |
| 1983 | 257 |
| 1984 | 228 |
| 1985 | 271 |
| 1986 | 143 |
| 1987 | 106 |
| 1988 | 96 |
| 1989 | 32 |
| 1990 | 20 |
| 1991 | 47 |
| 1992 | 6 |
| 1993 | 30 |
| 1996 | 10 |
| 1998 | 12 |
| 2003 | 22 |
| 2004 | 16 |
| 2005 | 18 |
| 2006 | 5 |
| 2007 | 5 |
| 2010 | 8 |
| 2022 | 5 |
| 2024 | 12 |