| Year | Count |
|---|---|
| 1931 | 15 |
| 1933 | 5 |
| 1943 | 5 |
| 1949 | 8 |
| 1950 | 20 |
| 1951 | 30 |
| 1952 | 45 |
| 1953 | 45 |
| 1954 | 35 |
| 1955 | 41 |
| 1956 | 62 |
| 1957 | 54 |
| 1958 | 63 |
| 1959 | 107 |
| 1960 | 56 |
| 1961 | 65 |
| 1962 | 22 |
| 1963 | 56 |
| 1964 | 36 |
| 1965 | 33 |
| 1966 | 41 |
| 1967 | 22 |
| 1968 | 62 |
| 1969 | 64 |
| 1970 | 77 |
| 1971 | 40 |
| 1972 | 54 |
| 1973 | 25 |
| 1974 | 26 |
| 1975 | 35 |
| 1977 | 37 |
| 1978 | 10 |
| 1979 | 47 |
| 1980 | 24 |
| 1981 | 29 |
| 1982 | 30 |
| 1983 | 16 |
| 1984 | 29 |
| 1985 | 29 |
| 1986 | 42 |
| 1987 | 25 |
| 1988 | 14 |
| 1989 | 21 |
| 1991 | 5 |
| 1992 | 7 |
| 1993 | 8 |
| 1995 | 5 |