| Year | Count |
|---|---|
| 1944 | 5 |
| 1946 | 7 |
| 1950 | 5 |
| 1952 | 7 |
| 1954 | 7 |
| 1955 | 13 |
| 1956 | 9 |
| 1957 | 18 |
| 1958 | 12 |
| 1959 | 14 |
| 1960 | 18 |
| 1962 | 5 |
| 1965 | 8 |
| 1966 | 6 |
| 1971 | 6 |
| 1986 | 5 |
| 1987 | 5 |
| 1988 | 5 |
| 1989 | 8 |
| 1990 | 14 |
| 1991 | 6 |
| 1992 | 7 |
| 1993 | 7 |
| 1994 | 12 |
| 1995 | 16 |
| 1996 | 11 |
| 1997 | 7 |
| 1998 | 6 |
| 1999 | 9 |
| 2000 | 6 |
| 2001 | 14 |
| 2002 | 12 |
| 2003 | 14 |
| 2004 | 11 |
| 2005 | 9 |
| 2006 | 5 |
| 2008 | 10 |
| 2010 | 6 |
| 2011 | 5 |