| Year | Count |
|---|---|
| 1918 | 5 |
| 1921 | 7 |
| 1922 | 5 |
| 1924 | 7 |
| 1925 | 7 |
| 1927 | 9 |
| 1928 | 7 |
| 1929 | 8 |
| 1939 | 6 |
| 1940 | 6 |
| 1945 | 7 |
| 1947 | 15 |
| 1948 | 6 |
| 1949 | 5 |
| 1954 | 18 |
| 1958 | 10 |
| 1960 | 16 |
| 1962 | 10 |
| 1967 | 12 |
| 1974 | 6 |
| 1977 | 5 |
| 1980 | 5 |
| 1982 | 6 |
| 1985 | 5 |
| 1987 | 8 |
| 1988 | 5 |
| 1989 | 7 |
| 1992 | 10 |
| 1993 | 5 |
| 1994 | 5 |
| 1995 | 10 |
| 1998 | 5 |
| 2000 | 6 |
| 2006 | 10 |