| Year | Count |
|---|---|
| 1916 | 15 |
| 1918 | 10 |
| 1919 | 6 |
| 1920 | 15 |
| 1922 | 15 |
| 1926 | 12 |
| 1930 | 6 |
| 1933 | 20 |
| 1936 | 5 |
| 1938 | 5 |
| 1939 | 8 |
| 1951 | 6 |
| 1957 | 5 |
| 1958 | 10 |
| 1960 | 7 |
| 1961 | 6 |
| 1962 | 6 |
| 1963 | 7 |
| 1964 | 12 |
| 1965 | 6 |
| 1967 | 8 |
| 1968 | 5 |
| 1970 | 6 |
| 1971 | 11 |
| 1972 | 11 |
| 1973 | 6 |
| 1974 | 8 |
| 1975 | 20 |
| 1976 | 10 |
| 1977 | 8 |
| 1978 | 7 |
| 1980 | 13 |
| 1981 | 8 |
| 1982 | 8 |
| 1983 | 12 |
| 1984 | 16 |
| 1985 | 9 |
| 1986 | 8 |
| 1987 | 11 |
| 1988 | 9 |
| 1990 | 9 |
| 1991 | 19 |
| 1992 | 16 |
| 1993 | 10 |
| 1994 | 16 |
| 1996 | 12 |
| 1997 | 8 |
| 1998 | 7 |
| 2002 | 15 |
| 2005 | 8 |
| 2013 | 10 |
| 2015 | 12 |