| Year | Count |
|---|---|
| 1939 | 5 |
| 1943 | 5 |
| 1944 | 21 |
| 1947 | 11 |
| 1948 | 37 |
| 1949 | 64 |
| 1950 | 209 |
| 1951 | 194 |
| 1952 | 235 |
| 1953 | 179 |
| 1954 | 206 |
| 1955 | 243 |
| 1956 | 248 |
| 1957 | 222 |
| 1958 | 260 |
| 1959 | 209 |
| 1960 | 224 |
| 1961 | 198 |
| 1962 | 185 |
| 1963 | 196 |
| 1964 | 217 |
| 1965 | 106 |
| 1966 | 129 |
| 1967 | 129 |
| 1968 | 182 |
| 1969 | 112 |
| 1970 | 122 |
| 1971 | 106 |
| 1972 | 66 |
| 1973 | 28 |
| 1974 | 47 |
| 1975 | 28 |
| 1976 | 22 |
| 1977 | 28 |
| 1978 | 23 |
| 1979 | 32 |
| 1980 | 16 |
| 1981 | 10 |
| 1982 | 17 |
| 1983 | 23 |
| 1984 | 23 |
| 1985 | 60 |
| 1986 | 24 |
| 1987 | 16 |
| 1995 | 7 |
| 1996 | 7 |
| 1997 | 7 |
| 1998 | 24 |
| 2003 | 10 |