| Year | Count |
|---|---|
| 1915 | 5 |
| 1917 | 8 |
| 1918 | 7 |
| 1919 | 5 |
| 1930 | 6 |
| 1932 | 5 |
| 1942 | 5 |
| 1943 | 5 |
| 1944 | 5 |
| 1946 | 9 |
| 1950 | 10 |
| 1951 | 5 |
| 1956 | 14 |
| 1959 | 8 |
| 1960 | 5 |
| 1964 | 5 |
| 1969 | 5 |
| 1970 | 10 |
| 1971 | 5 |
| 1975 | 5 |
| 1980 | 5 |
| 1982 | 10 |
| 1984 | 32 |
| 1985 | 49 |
| 1986 | 17 |
| 1987 | 22 |
| 1988 | 16 |
| 1989 | 10 |
| 1990 | 5 |
| 1991 | 26 |
| 1992 | 5 |
| 1993 | 5 |
| 1994 | 12 |
| 1995 | 5 |
| 1996 | 13 |
| 1997 | 10 |
| 1998 | 5 |
| 2000 | 7 |
| 2001 | 6 |
| 2003 | 20 |
| 2004 | 22 |
| 2006 | 18 |
| 2008 | 5 |
| 2012 | 12 |
| 2015 | 5 |
| 2017 | 10 |