| Year | Count |
|---|---|
| 1987 | 5 |
| 1993 | 9 |
| 1994 | 9 |
| 1995 | 10 |
| 1997 | 20 |
| 1998 | 86 |
| 1999 | 101 |
| 2000 | 102 |
| 2001 | 166 |
| 2002 | 134 |
| 2003 | 195 |
| 2004 | 196 |
| 2005 | 185 |
| 2006 | 191 |
| 2007 | 203 |
| 2008 | 207 |
| 2009 | 201 |
| 2010 | 166 |
| 2011 | 162 |
| 2012 | 163 |
| 2013 | 180 |
| 2014 | 158 |
| 2015 | 131 |
| 2016 | 336 |
| 2017 | 309 |
| 2018 | 270 |
| 2019 | 184 |
| 2020 | 140 |
| 2021 | 160 |
| 2022 | 130 |
| 2023 | 122 |
| 2024 | 124 |