| Year | Count |
|---|---|
| 1978 | 40 |
| 1979 | 10 |
| 1980 | 29 |
| 1981 | 54 |
| 1982 | 32 |
| 1983 | 38 |
| 1984 | 5 |
| 1985 | 5 |
| 1986 | 20 |
| 1987 | 6 |
| 1988 | 5 |
| 1989 | 11 |
| 1990 | 15 |
| 1991 | 32 |
| 1992 | 49 |
| 1993 | 50 |
| 1994 | 74 |
| 1995 | 96 |
| 1996 | 77 |
| 1997 | 116 |
| 1998 | 79 |
| 1999 | 81 |
| 2000 | 107 |
| 2001 | 96 |
| 2002 | 21 |
| 2003 | 44 |
| 2004 | 10 |
| 2005 | 55 |
| 2006 | 6 |
| 2007 | 9 |
| 2008 | 15 |
| 2009 | 21 |
| 2011 | 5 |
| 2014 | 12 |
| 2017 | 6 |
| 2022 | 12 |