| Year | Count |
|---|---|
| 1919 | 5 |
| 1923 | 5 |
| 1925 | 6 |
| 1927 | 9 |
| 1928 | 7 |
| 1939 | 8 |
| 1941 | 7 |
| 1943 | 9 |
| 1945 | 7 |
| 1947 | 41 |
| 1948 | 6 |
| 1949 | 5 |
| 1955 | 15 |
| 1959 | 12 |
| 1960 | 10 |
| 1962 | 12 |
| 1963 | 10 |
| 1965 | 12 |
| 1967 | 16 |
| 1971 | 15 |
| 1972 | 8 |
| 1973 | 7 |
| 1974 | 7 |
| 1975 | 8 |
| 1978 | 5 |
| 1979 | 8 |
| 1981 | 7 |
| 1982 | 5 |
| 1984 | 6 |
| 1986 | 8 |
| 1989 | 10 |
| 1990 | 13 |
| 1991 | 5 |
| 1993 | 7 |
| 1994 | 6 |
| 1995 | 5 |
| 1996 | 6 |
| 1997 | 5 |
| 1998 | 7 |
| 1999 | 5 |
| 2006 | 7 |
| 2013 | 10 |
| 2018 | 5 |