| Year | Count |
|---|---|
| 1990 | 5 |
| 1993 | 6 |
| 1994 | 9 |
| 1995 | 13 |
| 1996 | 22 |
| 1997 | 18 |
| 1998 | 28 |
| 1999 | 23 |
| 2000 | 23 |
| 2001 | 76 |
| 2002 | 35 |
| 2003 | 14 |
| 2004 | 29 |
| 2005 | 70 |
| 2006 | 114 |
| 2007 | 69 |
| 2008 | 162 |
| 2009 | 88 |
| 2010 | 98 |
| 2011 | 20 |
| 2012 | 102 |
| 2013 | 98 |
| 2014 | 72 |
| 2015 | 108 |
| 2016 | 116 |
| 2017 | 71 |
| 2018 | 62 |
| 2019 | 61 |
| 2020 | 52 |
| 2021 | 107 |
| 2022 | 49 |
| 2023 | 52 |
| 2024 | 5 |
| 2024 | 21 |