| Year | Count |
|---|---|
| 1929 | 39 |
| 1930 | 37 |
| 1931 | 30 |
| 1934 | 5 |
| 1942 | 7 |
| 1946 | 6 |
| 1947 | 21 |
| 1948 | 20 |
| 1949 | 11 |
| 1950 | 5 |
| 1951 | 5 |
| 1952 | 5 |
| 1953 | 63 |
| 1954 | 5 |
| 1955 | 55 |
| 1956 | 21 |
| 1958 | 12 |
| 1959 | 31 |
| 1960 | 29 |
| 1961 | 5 |
| 1962 | 41 |
| 1964 | 18 |
| 1965 | 12 |
| 1967 | 20 |
| 1970 | 30 |
| 1971 | 17 |
| 1972 | 5 |
| 1973 | 34 |
| 1976 | 12 |
| 1977 | 5 |
| 1978 | 12 |
| 1979 | 10 |
| 1981 | 5 |
| 1988 | 6 |
| 1993 | 82 |
| 1994 | 43 |
| 1995 | 10 |
| 1996 | 15 |