| Year | Count |
|---|---|
| 1917 | 6 |
| 1918 | 6 |
| 1923 | 17 |
| 1925 | 9 |
| 1926 | 9 |
| 1927 | 7 |
| 1928 | 8 |
| 1929 | 13 |
| 1930 | 9 |
| 1938 | 5 |
| 1939 | 8 |
| 1940 | 7 |
| 1941 | 6 |
| 1942 | 7 |
| 1946 | 6 |
| 1947 | 45 |
| 1948 | 10 |
| 1949 | 6 |
| 1955 | 24 |
| 1957 | 12 |
| 1958 | 10 |
| 1959 | 10 |
| 1960 | 14 |
| 1963 | 12 |
| 1964 | 12 |
| 1966 | 23 |
| 1967 | 10 |
| 1968 | 12 |
| 1971 | 9 |
| 1972 | 11 |
| 1973 | 7 |
| 1976 | 8 |
| 1977 | 7 |
| 1980 | 5 |
| 1981 | 6 |
| 1982 | 7 |
| 1983 | 15 |
| 1985 | 8 |
| 1986 | 6 |
| 1990 | 6 |
| 1996 | 5 |
| 1997 | 5 |
| 1999 | 6 |
| 2000 | 6 |
| 2006 | 5 |
| 2008 | 18 |