| Year | Count |
|---|---|
| 1939 | 5 |
| 1941 | 8 |
| 1942 | 6 |
| 1943 | 5 |
| 1944 | 5 |
| 1946 | 5 |
| 1947 | 6 |
| 1948 | 7 |
| 1949 | 6 |
| 1951 | 7 |
| 1953 | 53 |
| 1954 | 56 |
| 1955 | 60 |
| 1956 | 59 |
| 1957 | 134 |
| 1958 | 110 |
| 1959 | 90 |
| 1960 | 70 |
| 1961 | 96 |
| 1963 | 34 |
| 1964 | 26 |
| 1965 | 26 |
| 1966 | 13 |
| 1967 | 11 |
| 1968 | 12 |
| 1969 | 11 |
| 1970 | 13 |
| 1971 | 5 |
| 1972 | 7 |
| 1974 | 5 |
| 1975 | 10 |
| 1976 | 14 |
| 1977 | 22 |
| 1978 | 26 |
| 1979 | 20 |
| 1981 | 12 |
| 1982 | 12 |
| 1983 | 6 |
| 1984 | 6 |
| 1985 | 5 |
| 1986 | 8 |
| 1987 | 9 |
| 1988 | 5 |
| 1989 | 10 |
| 1992 | 7 |
| 1993 | 6 |
| 2016 | 18 |
| 2018 | 10 |
| 2020 | 12 |
| 2021 | 10 |
| 2022 | 14 |
| 2024 | 14 |