| Year | Count |
|---|---|
| 1930 | 31 |
| 1931 | 21 |
| 1933 | 18 |
| 1936 | 5 |
| 1938 | 5 |
| 1941 | 5 |
| 1942 | 10 |
| 1943 | 15 |
| 1945 | 5 |
| 1946 | 15 |
| 1948 | 33 |
| 1949 | 15 |
| 1950 | 25 |
| 1951 | 45 |
| 1952 | 56 |
| 1953 | 51 |
| 1954 | 15 |
| 1955 | 49 |
| 1956 | 44 |
| 1957 | 5 |
| 1958 | 12 |
| 1959 | 12 |
| 1961 | 27 |
| 1963 | 21 |
| 1964 | 5 |
| 1968 | 25 |
| 1971 | 7 |
| 1973 | 5 |
| 1976 | 10 |
| 1977 | 7 |
| 1978 | 21 |
| 1979 | 29 |
| 1980 | 5 |
| 1981 | 23 |
| 1982 | 39 |
| 1983 | 30 |
| 1984 | 32 |
| 1985 | 33 |
| 1986 | 19 |
| 1987 | 25 |
| 1988 | 16 |
| 1990 | 20 |
| 1991 | 12 |
| 1993 | 6 |
| 1994 | 15 |
| 1995 | 5 |
| 1996 | 5 |
| 1997 | 5 |