| Year | Count |
|---|---|
| 1936 | 10 |
| 1939 | 5 |
| 1940 | 5 |
| 1941 | 7 |
| 1942 | 22 |
| 1944 | 71 |
| 1945 | 71 |
| 1946 | 31 |
| 1947 | 56 |
| 1948 | 39 |
| 1949 | 94 |
| 1950 | 97 |
| 1951 | 112 |
| 1952 | 110 |
| 1953 | 119 |
| 1954 | 120 |
| 1955 | 170 |
| 1956 | 193 |
| 1957 | 132 |
| 1958 | 98 |
| 1959 | 157 |
| 1960 | 163 |
| 1961 | 165 |
| 1962 | 197 |
| 1963 | 128 |
| 1964 | 126 |
| 1965 | 105 |
| 1966 | 131 |
| 1967 | 155 |
| 1968 | 179 |
| 1969 | 212 |
| 1970 | 215 |
| 1971 | 203 |
| 1972 | 162 |
| 1973 | 124 |
| 1974 | 131 |
| 1975 | 63 |
| 1976 | 181 |
| 1977 | 177 |
| 1978 | 116 |
| 1979 | 107 |
| 1980 | 84 |
| 1981 | 80 |
| 1982 | 36 |
| 1983 | 40 |
| 1984 | 30 |
| 1985 | 60 |
| 1986 | 74 |
| 1987 | 42 |
| 1988 | 12 |
| 1989 | 16 |
| 1990 | 15 |
| 1993 | 5 |
| 1995 | 12 |
| 2000 | 10 |