| Year | Count |
|---|---|
| 1919 | 6 |
| 1921 | 6 |
| 1925 | 5 |
| 1927 | 10 |
| 1928 | 5 |
| 1929 | 5 |
| 1930 | 10 |
| 1935 | 6 |
| 1939 | 5 |
| 1940 | 6 |
| 1941 | 8 |
| 1944 | 7 |
| 1945 | 10 |
| 1946 | 6 |
| 1947 | 15 |
| 1948 | 10 |
| 1949 | 6 |
| 1950 | 6 |
| 1951 | 5 |
| 1952 | 7 |
| 1953 | 5 |
| 1954 | 9 |
| 1955 | 21 |
| 1956 | 21 |
| 1958 | 28 |
| 1960 | 11 |
| 1963 | 6 |
| 1964 | 11 |
| 1965 | 12 |
| 1966 | 5 |
| 1967 | 10 |
| 1968 | 22 |
| 1969 | 15 |
| 1970 | 7 |
| 1971 | 10 |
| 1973 | 8 |
| 1975 | 11 |
| 1976 | 6 |
| 1977 | 8 |
| 1979 | 5 |
| 1980 | 11 |
| 1981 | 6 |
| 1988 | 6 |
| 1991 | 5 |
| 1994 | 6 |
| 1995 | 6 |
| 1996 | 7 |
| 2000 | 5 |
| 2005 | 5 |
| 2014 | 10 |