| Year | Count |
|---|---|
| 1988 | 21 |
| 1989 | 18 |
| 1990 | 33 |
| 1991 | 24 |
| 1992 | 38 |
| 1993 | 145 |
| 1994 | 64 |
| 1995 | 40 |
| 1996 | 92 |
| 1997 | 103 |
| 1997 | 6 |
| 1998 | 206 |
| 1999 | 88 |
| 2000 | 145 |
| 2000 | 10 |
| 2001 | 168 |
| 2002 | 132 |
| 2003 | 194 |
| 2004 | 269 |
| 2004 | 10 |
| 2005 | 373 |
| 2006 | 326 |
| 2006 | 5 |
| 2007 | 364 |
| 2007 | 15 |
| 2008 | 438 |
| 2009 | 385 |
| 2009 | 17 |
| 2010 | 355 |
| 2010 | 14 |
| 2011 | 339 |
| 2011 | 5 |
| 2012 | 311 |
| 2012 | 44 |
| 2013 | 246 |
| 2013 | 42 |
| 2014 | 207 |
| 2014 | 45 |
| 2015 | 214 |
| 2015 | 10 |
| 2016 | 127 |
| 2017 | 153 |
| 2017 | 10 |
| 2018 | 89 |
| 2019 | 69 |
| 2019 | 14 |
| 2020 | 46 |
| 2021 | 24 |
| 2021 | 15 |
| 2022 | 52 |
| 2022 | 14 |
| 2023 | 34 |
| 2023 | 18 |