| Year | Count |
|---|---|
| 1915 | 10 |
| 1917 | 5 |
| 1919 | 11 |
| 1920 | 9 |
| 1921 | 7 |
| 1922 | 13 |
| 1923 | 13 |
| 1924 | 17 |
| 1925 | 13 |
| 1926 | 11 |
| 1927 | 10 |
| 1928 | 11 |
| 1929 | 28 |
| 1930 | 19 |
| 1932 | 10 |
| 1939 | 9 |
| 1940 | 16 |
| 1942 | 7 |
| 1943 | 6 |
| 1944 | 7 |
| 1945 | 11 |
| 1946 | 6 |
| 1947 | 33 |
| 1948 | 19 |
| 1949 | 8 |
| 1955 | 18 |
| 1956 | 16 |
| 1957 | 10 |
| 1960 | 14 |
| 1962 | 12 |
| 1963 | 18 |
| 1964 | 10 |
| 1966 | 18 |
| 1969 | 10 |
| 1971 | 8 |
| 1972 | 5 |
| 1974 | 9 |
| 1975 | 8 |
| 1976 | 6 |
| 1978 | 6 |
| 1982 | 5 |
| 1983 | 7 |
| 1984 | 5 |
| 1985 | 6 |
| 1988 | 6 |
| 1989 | 7 |
| 1991 | 8 |
| 1992 | 6 |
| 1993 | 8 |
| 1995 | 5 |
| 1997 | 8 |
| 2010 | 5 |