| Year | Count |
|---|---|
| 1914 | 5 |
| 1915 | 5 |
| 1917 | 6 |
| 1920 | 10 |
| 1921 | 5 |
| 1922 | 17 |
| 1923 | 10 |
| 1924 | 10 |
| 1925 | 7 |
| 1926 | 5 |
| 1927 | 5 |
| 1929 | 6 |
| 1931 | 7 |
| 1932 | 5 |
| 1938 | 10 |
| 1941 | 8 |
| 1942 | 5 |
| 1943 | 5 |
| 1946 | 7 |
| 1948 | 6 |
| 1949 | 5 |
| 1952 | 5 |
| 1955 | 5 |
| 1958 | 5 |
| 1959 | 6 |
| 1962 | 5 |
| 1980 | 9 |
| 1981 | 6 |
| 1983 | 7 |
| 1986 | 9 |
| 1987 | 7 |
| 1988 | 6 |
| 1990 | 8 |
| 1992 | 13 |
| 1993 | 12 |
| 1994 | 8 |
| 1995 | 14 |
| 1996 | 8 |
| 1998 | 5 |
| 2000 | 6 |
| 2001 | 21 |
| 2002 | 9 |
| 2004 | 9 |
| 2005 | 17 |
| 2006 | 9 |
| 2007 | 8 |
| 2012 | 5 |