| Year | Count |
|---|---|
| 1989 | 7 |
| 1991 | 9 |
| 1992 | 12 |
| 1993 | 17 |
| 1994 | 47 |
| 1995 | 44 |
| 1996 | 71 |
| 1997 | 90 |
| 1998 | 129 |
| 1999 | 132 |
| 2000 | 124 |
| 2001 | 194 |
| 2002 | 194 |
| 2003 | 184 |
| 2004 | 197 |
| 2005 | 231 |
| 2006 | 239 |
| 2007 | 226 |
| 2008 | 310 |
| 2009 | 253 |
| 2010 | 290 |
| 2011 | 259 |
| 2012 | 209 |
| 2013 | 172 |
| 2014 | 142 |
| 2015 | 118 |
| 2016 | 330 |
| 2017 | 237 |
| 2018 | 246 |
| 2019 | 126 |
| 2020 | 102 |
| 2021 | 122 |
| 2022 | 122 |
| 2023 | 72 |
| 2024 | 72 |