| Year | Count |
|---|---|
| 1919 | 5 |
| 1925 | 10 |
| 1953 | 5 |
| 1955 | 5 |
| 1956 | 6 |
| 1957 | 10 |
| 1958 | 5 |
| 1962 | 14 |
| 1963 | 5 |
| 1966 | 7 |
| 1969 | 5 |
| 1970 | 9 |
| 1972 | 13 |
| 1973 | 13 |
| 1974 | 6 |
| 1975 | 23 |
| 1976 | 20 |
| 1977 | 9 |
| 1979 | 14 |
| 1980 | 11 |
| 1981 | 16 |
| 1982 | 7 |
| 1983 | 10 |
| 1984 | 5 |
| 1985 | 14 |
| 1986 | 7 |
| 1987 | 17 |
| 1988 | 18 |
| 1989 | 20 |
| 1990 | 6 |
| 1991 | 16 |
| 1992 | 9 |
| 1993 | 29 |
| 1994 | 11 |
| 1995 | 12 |
| 1996 | 15 |
| 1997 | 24 |
| 1998 | 17 |
| 1999 | 25 |
| 2000 | 15 |
| 2001 | 53 |
| 2003 | 5 |
| 2004 | 31 |
| 2005 | 29 |
| 2006 | 33 |
| 2007 | 19 |
| 2008 | 63 |
| 2009 | 13 |
| 2010 | 11 |
| 2012 | 10 |
| 2014 | 10 |
| 2015 | 10 |