| Year | Count |
|---|---|
| 1982 | 5 |
| 1983 | 38 |
| 1984 | 21 |
| 1985 | 31 |
| 1986 | 17 |
| 1987 | 20 |
| 1988 | 80 |
| 1989 | 59 |
| 1990 | 103 |
| 1991 | 61 |
| 1992 | 160 |
| 1993 | 116 |
| 1994 | 190 |
| 1994 | 6 |
| 1995 | 151 |
| 1996 | 183 |
| 1997 | 284 |
| 1998 | 239 |
| 1999 | 186 |
| 2000 | 159 |
| 2000 | 16 |
| 2001 | 160 |
| 2002 | 83 |
| 2003 | 87 |
| 2004 | 76 |
| 2005 | 136 |
| 2006 | 109 |
| 2007 | 82 |
| 2008 | 96 |
| 2009 | 80 |
| 2010 | 102 |
| 2011 | 42 |
| 2012 | 59 |