| Year | Count |
|---|---|
| 1925 | 7 |
| 1927 | 6 |
| 1930 | 10 |
| 1931 | 8 |
| 1939 | 8 |
| 1940 | 7 |
| 1941 | 5 |
| 1943 | 6 |
| 1944 | 8 |
| 1945 | 6 |
| 1946 | 7 |
| 1947 | 15 |
| 1948 | 11 |
| 1955 | 21 |
| 1956 | 10 |
| 1957 | 10 |
| 1958 | 16 |
| 1959 | 10 |
| 1960 | 10 |
| 1963 | 10 |
| 1964 | 16 |
| 1965 | 12 |
| 1966 | 10 |
| 1968 | 10 |
| 1969 | 5 |
| 1977 | 5 |
| 1978 | 5 |
| 1980 | 6 |
| 1982 | 5 |
| 1986 | 5 |
| 1990 | 8 |
| 1996 | 6 |
| 1997 | 5 |
| 1999 | 5 |
| 2000 | 7 |