| Year | Count |
|---|---|
| 1914 | 6 |
| 1917 | 7 |
| 1925 | 5 |
| 1926 | 8 |
| 1933 | 6 |
| 1934 | 6 |
| 1944 | 5 |
| 1952 | 5 |
| 1956 | 6 |
| 1958 | 5 |
| 1961 | 8 |
| 1964 | 11 |
| 1965 | 6 |
| 1966 | 5 |
| 1967 | 6 |
| 1968 | 5 |
| 1970 | 13 |
| 1971 | 5 |
| 1972 | 5 |
| 1981 | 5 |
| 1983 | 8 |
| 1986 | 5 |
| 1987 | 5 |
| 1988 | 6 |
| 1990 | 6 |
| 1993 | 5 |
| 1994 | 7 |
| 1995 | 10 |
| 1996 | 9 |
| 1998 | 8 |
| 1999 | 6 |
| 2001 | 8 |
| 2005 | 5 |
| 2008 | 5 |