| Year | Count |
|---|---|
| 1943 | 18 |
| 1960 | 5 |
| 1961 | 5 |
| 1963 | 16 |
| 1964 | 9 |
| 1968 | 5 |
| 1970 | 12 |
| 1971 | 6 |
| 1974 | 12 |
| 1981 | 21 |
| 1982 | 7 |
| 1983 | 5 |
| 1984 | 19 |
| 1987 | 5 |
| 1988 | 11 |
| 1989 | 17 |
| 1990 | 16 |
| 1991 | 5 |
| 1992 | 35 |
| 1992 | 45 |
| 1993 | 10 |
| 1993 | 25 |
| 1994 | 13 |
| 1996 | 17 |
| 1997 | 15 |
| 1998 | 12 |
| 1998 | 23 |
| 1999 | 10 |
| 2000 | 21 |
| 2000 | 12 |
| 2003 | 28 |
| 2004 | 47 |
| 2005 | 40 |
| 2006 | 14 |
| 2007 | 28 |
| 2008 | 10 |
| 2009 | 16 |
| 2011 | 22 |
| 2012 | 15 |
| 2013 | 10 |
| 2014 | 5 |
| 2019 | 10 |