| Year | Count |
|---|---|
| 1988 | 12 |
| 1992 | 5 |
| 1995 | 31 |
| 1996 | 28 |
| 1997 | 48 |
| 1998 | 71 |
| 1999 | 61 |
| 2000 | 111 |
| 2001 | 67 |
| 2002 | 227 |
| 2003 | 204 |
| 2004 | 246 |
| 2005 | 354 |
| 2006 | 278 |
| 2006 | 10 |
| 2007 | 266 |
| 2008 | 324 |
| 2009 | 177 |
| 2010 | 214 |
| 2011 | 161 |
| 2012 | 175 |
| 2013 | 184 |
| 2014 | 125 |
| 2015 | 205 |
| 2016 | 132 |
| 2017 | 148 |
| 2018 | 105 |
| 2019 | 53 |
| 2020 | 59 |
| 2021 | 23 |
| 2022 | 30 |
| 2023 | 50 |
| 2024 | 13 |