| Year | Count |
|---|---|
| 1987 | 7 |
| 1988 | 6 |
| 1988 | 41 |
| 1989 | 78 |
| 1990 | 88 |
| 1991 | 20 |
| 1991 | 113 |
| 1992 | 118 |
| 1993 | 215 |
| 1994 | 6 |
| 1994 | 124 |
| 1995 | 11 |
| 1995 | 110 |
| 1996 | 11 |
| 1996 | 123 |
| 1997 | 6 |
| 1997 | 66 |
| 1998 | 131 |
| 1999 | 84 |
| 2000 | 5 |
| 2000 | 61 |
| 2001 | 57 |
| 2002 | 33 |
| 2003 | 15 |
| 2004 | 21 |
| 2005 | 15 |
| 2006 | 15 |
| 2007 | 41 |
| 2008 | 15 |
| 2009 | 13 |
| 2010 | 6 |
| 2011 | 10 |
| 2012 | 5 |
| 2013 | 7 |
| 2014 | 10 |
| 2018 | 20 |
| 2019 | 10 |
| 2021 | 22 |
| 2022 | 11 |
| 2023 | 10 |