| Year | Count |
|---|---|
| 1986 | 6 |
| 1987 | 5 |
| 1990 | 5 |
| 1991 | 11 |
| 1992 | 23 |
| 1993 | 11 |
| 1994 | 14 |
| 1995 | 12 |
| 1996 | 110 |
| 1997 | 62 |
| 1998 | 46 |
| 1999 | 46 |
| 2000 | 73 |
| 2001 | 175 |
| 2002 | 189 |
| 2003 | 340 |
| 2004 | 260 |
| 2005 | 283 |
| 2006 | 253 |
| 2007 | 215 |
| 2008 | 205 |
| 2009 | 232 |
| 2010 | 195 |
| 2011 | 146 |
| 2012 | 159 |
| 2013 | 257 |
| 2014 | 182 |
| 2015 | 187 |
| 2016 | 201 |
| 2017 | 151 |
| 2018 | 185 |
| 2019 | 173 |
| 2020 | 176 |
| 2021 | 241 |
| 2022 | 160 |
| 2023 | 150 |
| 2024 | 147 |