| Year | Count |
|---|---|
| 1928 | 8 |
| 1930 | 5 |
| 1933 | 12 |
| 1936 | 6 |
| 1937 | 18 |
| 1938 | 6 |
| 1940 | 6 |
| 1942 | 15 |
| 1944 | 30 |
| 1945 | 15 |
| 1946 | 15 |
| 1947 | 18 |
| 1949 | 15 |
| 1955 | 5 |
| 1957 | 7 |
| 1959 | 5 |
| 1961 | 6 |
| 1963 | 6 |
| 1964 | 5 |
| 1966 | 5 |
| 1972 | 6 |
| 1974 | 5 |
| 1976 | 6 |
| 1979 | 5 |
| 1981 | 5 |
| 1982 | 16 |
| 1983 | 9 |
| 1987 | 8 |
| 1988 | 16 |
| 1989 | 13 |
| 1990 | 19 |
| 1991 | 13 |
| 1992 | 29 |
| 1993 | 5 |
| 1994 | 5 |
| 1996 | 9 |
| 1997 | 7 |
| 1998 | 5 |
| 2003 | 19 |