| Year | Count |
|---|---|
| 1919 | 7 |
| 1921 | 9 |
| 1922 | 7 |
| 1926 | 5 |
| 1927 | 6 |
| 1928 | 7 |
| 1930 | 5 |
| 1931 | 8 |
| 1941 | 5 |
| 1942 | 6 |
| 1943 | 5 |
| 1944 | 10 |
| 1945 | 7 |
| 1946 | 11 |
| 1947 | 18 |
| 1954 | 15 |
| 1955 | 21 |
| 1956 | 24 |
| 1957 | 12 |
| 1960 | 18 |
| 1962 | 14 |
| 1963 | 10 |
| 1965 | 12 |
| 1967 | 10 |
| 1970 | 7 |
| 1971 | 9 |
| 1972 | 5 |
| 1974 | 5 |
| 1977 | 7 |
| 1978 | 5 |
| 1980 | 6 |
| 1981 | 5 |
| 1983 | 6 |
| 1987 | 8 |
| 1989 | 6 |
| 1991 | 9 |
| 1997 | 5 |
| 2000 | 7 |
| 2007 | 20 |
| 2009 | 5 |