| Year | Count |
|---|---|
| 1945 | 5 |
| 1951 | 8 |
| 1952 | 9 |
| 1953 | 6 |
| 1954 | 7 |
| 1955 | 28 |
| 1956 | 65 |
| 1957 | 67 |
| 1958 | 78 |
| 1959 | 72 |
| 1960 | 137 |
| 1961 | 115 |
| 1962 | 63 |
| 1963 | 89 |
| 1964 | 150 |
| 1965 | 108 |
| 1966 | 158 |
| 1967 | 190 |
| 1968 | 153 |
| 1969 | 168 |
| 1970 | 160 |
| 1971 | 169 |
| 1972 | 122 |
| 1973 | 69 |
| 1974 | 54 |
| 1975 | 54 |
| 1976 | 55 |
| 1977 | 72 |
| 1978 | 59 |
| 1979 | 44 |
| 1980 | 15 |
| 1981 | 58 |
| 1982 | 41 |
| 1983 | 27 |
| 1984 | 32 |
| 1985 | 34 |
| 1986 | 53 |
| 1987 | 40 |
| 1988 | 24 |
| 1989 | 9 |
| 1990 | 7 |
| 1991 | 24 |
| 1992 | 12 |
| 1994 | 22 |
| 1995 | 8 |
| 1996 | 6 |
| 1997 | 5 |
| 1998 | 30 |
| 2003 | 22 |
| 2004 | 16 |
| 2005 | 26 |
| 2007 | 7 |
| 2014 | 6 |
| 2016 | 9 |
| 2018 | 9 |
| 2019 | 5 |
| 2020 | 7 |
| 2021 | 7 |
| 2022 | 14 |
| 2023 | 15 |
| 2024 | 10 |