| Year | Count |
|---|---|
| 1920 | 6 |
| 1921 | 7 |
| 1922 | 11 |
| 1924 | 5 |
| 1928 | 13 |
| 1930 | 7 |
| 1931 | 13 |
| 1932 | 6 |
| 1933 | 6 |
| 1934 | 20 |
| 1935 | 6 |
| 1936 | 10 |
| 1939 | 8 |
| 1940 | 24 |
| 1941 | 12 |
| 1942 | 22 |
| 1943 | 12 |
| 1944 | 10 |
| 1946 | 17 |
| 1947 | 33 |
| 1948 | 13 |
| 1949 | 6 |
| 1951 | 11 |
| 1954 | 23 |
| 1957 | 12 |
| 1959 | 14 |
| 1960 | 10 |
| 1962 | 10 |
| 1970 | 5 |
| 1973 | 5 |
| 1976 | 5 |
| 1980 | 5 |
| 1985 | 30 |
| 1987 | 18 |
| 1988 | 15 |
| 1990 | 11 |
| 1991 | 8 |
| 1992 | 5 |
| 1993 | 7 |
| 1996 | 5 |
| 2001 | 5 |