| Year | Count |
|---|---|
| 1946 | 5 |
| 1947 | 16 |
| 1948 | 28 |
| 1949 | 54 |
| 1950 | 70 |
| 1951 | 84 |
| 1952 | 83 |
| 1953 | 110 |
| 1954 | 82 |
| 1955 | 91 |
| 1956 | 73 |
| 1957 | 92 |
| 1958 | 178 |
| 1959 | 94 |
| 1960 | 103 |
| 1961 | 127 |
| 1962 | 57 |
| 1963 | 72 |
| 1964 | 53 |
| 1965 | 68 |
| 1966 | 79 |
| 1967 | 55 |
| 1968 | 16 |
| 1969 | 52 |
| 1970 | 43 |
| 1971 | 26 |
| 1972 | 16 |
| 1973 | 36 |
| 1974 | 21 |
| 1975 | 13 |
| 1976 | 36 |
| 1977 | 5 |
| 1978 | 30 |
| 1979 | 10 |
| 1980 | 21 |
| 1981 | 22 |
| 1982 | 5 |
| 1983 | 10 |
| 1985 | 18 |
| 1986 | 18 |
| 1987 | 22 |
| 1989 | 7 |
| 1990 | 7 |
| 1992 | 5 |
| 1993 | 24 |
| 1994 | 5 |
| 1995 | 7 |
| 1996 | 25 |
| 1997 | 14 |
| 1999 | 27 |
| 2002 | 10 |
| 2003 | 5 |
| 2004 | 12 |
| 2014 | 6 |
| 2016 | 5 |
| 2017 | 5 |