| Year | Count |
|---|---|
| 1917 | 5 |
| 1918 | 5 |
| 1920 | 5 |
| 1925 | 8 |
| 1926 | 11 |
| 1927 | 5 |
| 1930 | 6 |
| 1939 | 11 |
| 1940 | 17 |
| 1941 | 10 |
| 1942 | 5 |
| 1943 | 7 |
| 1944 | 7 |
| 1945 | 5 |
| 1946 | 6 |
| 1947 | 18 |
| 1948 | 13 |
| 1949 | 10 |
| 1955 | 21 |
| 1956 | 22 |
| 1957 | 14 |
| 1958 | 20 |
| 1959 | 16 |
| 1960 | 16 |
| 1962 | 14 |
| 1963 | 22 |
| 1965 | 12 |
| 1966 | 16 |
| 1968 | 12 |
| 1969 | 6 |
| 1970 | 8 |
| 1971 | 6 |
| 1972 | 10 |
| 1973 | 6 |
| 1974 | 8 |
| 1975 | 6 |
| 1977 | 6 |
| 1978 | 5 |
| 1979 | 6 |
| 1981 | 6 |
| 1982 | 5 |
| 1983 | 8 |
| 1984 | 5 |
| 1985 | 6 |
| 1990 | 6 |
| 1993 | 7 |
| 1995 | 5 |
| 1996 | 5 |
| 2000 | 5 |
| 2006 | 5 |