| Year | Count |
|---|---|
| 1931 | 8 |
| 1932 | 8 |
| 1933 | 6 |
| 1934 | 5 |
| 1935 | 5 |
| 1936 | 5 |
| 1938 | 5 |
| 1942 | 10 |
| 1948 | 6 |
| 1951 | 5 |
| 1954 | 5 |
| 1963 | 8 |
| 1968 | 6 |
| 1979 | 6 |
| 1981 | 7 |
| 1983 | 5 |
| 1984 | 7 |
| 1985 | 6 |
| 1986 | 7 |
| 1988 | 7 |
| 1990 | 7 |
| 1991 | 13 |
| 1992 | 5 |
| 1993 | 6 |
| 1994 | 5 |
| 1995 | 7 |
| 1997 | 6 |
| 2000 | 7 |
| 2003 | 5 |
| 2006 | 11 |
| 2007 | 5 |
| 2009 | 7 |
| 2011 | 6 |
| 2012 | 6 |
| 2015 | 10 |
| 2016 | 10 |
| 2021 | 6 |
| 2022 | 5 |