| Year | Count |
|---|---|
| 1991 | 5 |
| 1995 | 16 |
| 1996 | 44 |
| 1997 | 75 |
| 1998 | 108 |
| 1999 | 107 |
| 2000 | 145 |
| 2001 | 162 |
| 2002 | 218 |
| 2003 | 240 |
| 2004 | 238 |
| 2005 | 352 |
| 2006 | 323 |
| 2007 | 300 |
| 2008 | 337 |
| 2009 | 360 |
| 2010 | 356 |
| 2011 | 454 |
| 2012 | 467 |
| 2013 | 413 |
| 2014 | 393 |
| 2015 | 447 |
| 2016 | 440 |
| 2017 | 347 |
| 2018 | 268 |
| 2019 | 253 |
| 2020 | 147 |
| 2021 | 190 |
| 2022 | 174 |
| 2023 | 179 |
| 2024 | 199 |