| Year | Count |
|---|---|
| 1946 | 5 |
| 1955 | 11 |
| 1956 | 41 |
| 1957 | 57 |
| 1958 | 61 |
| 1959 | 63 |
| 1960 | 68 |
| 1961 | 85 |
| 1962 | 131 |
| 1963 | 106 |
| 1964 | 86 |
| 1965 | 67 |
| 1966 | 55 |
| 1967 | 44 |
| 1968 | 39 |
| 1969 | 35 |
| 1970 | 93 |
| 1971 | 78 |
| 1972 | 53 |
| 1973 | 51 |
| 1974 | 67 |
| 1975 | 78 |
| 1976 | 81 |
| 1977 | 109 |
| 1978 | 88 |
| 1979 | 41 |
| 1980 | 61 |
| 1981 | 50 |
| 1982 | 68 |
| 1983 | 60 |
| 1984 | 36 |
| 1985 | 38 |
| 1986 | 30 |
| 1987 | 32 |
| 1988 | 26 |
| 1989 | 10 |
| 1990 | 18 |
| 1991 | 22 |
| 1993 | 10 |
| 1994 | 7 |
| 1995 | 10 |
| 1996 | 5 |
| 1999 | 5 |
| 2000 | 12 |
| 2001 | 5 |
| 2005 | 7 |
| 2007 | 5 |
| 2010 | 5 |
| 2011 | 10 |
| 2015 | 5 |
| 2018 | 5 |
| 2020 | 6 |
| 2021 | 7 |
| 2022 | 15 |
| 2023 | 10 |
| 2024 | 38 |