| Year | Count |
|---|---|
| 1990 | 5 |
| 1991 | 13 |
| 1992 | 26 |
| 1993 | 18 |
| 1994 | 38 |
| 1995 | 58 |
| 1996 | 50 |
| 1997 | 63 |
| 1998 | 114 |
| 1999 | 132 |
| 2000 | 138 |
| 2001 | 192 |
| 2002 | 162 |
| 2003 | 180 |
| 2004 | 195 |
| 2005 | 175 |
| 2006 | 161 |
| 2007 | 144 |
| 2008 | 187 |
| 2009 | 152 |
| 2010 | 97 |
| 2011 | 67 |
| 2012 | 38 |
| 2013 | 24 |
| 2014 | 35 |
| 2015 | 32 |
| 2016 | 14 |
| 2017 | 42 |
| 2018 | 5 |
| 2019 | 25 |
| 2020 | 6 |
| 2022 | 10 |
| 2023 | 12 |
| 2024 | 5 |