| Year | Count |
|---|---|
| 1990 | 6 |
| 1991 | 8 |
| 1992 | 6 |
| 1993 | 14 |
| 1994 | 23 |
| 1995 | 22 |
| 1996 | 38 |
| 1997 | 35 |
| 1998 | 51 |
| 1999 | 39 |
| 2000 | 58 |
| 2001 | 58 |
| 2002 | 63 |
| 2003 | 54 |
| 2004 | 84 |
| 2005 | 84 |
| 2006 | 66 |
| 2007 | 67 |
| 2008 | 68 |
| 2009 | 63 |
| 2010 | 58 |
| 2011 | 50 |
| 2012 | 40 |
| 2013 | 57 |
| 2014 | 53 |
| 2015 | 44 |
| 2016 | 174 |
| 2017 | 174 |
| 2018 | 207 |
| 2019 | 126 |
| 2020 | 82 |
| 2021 | 136 |
| 2022 | 144 |
| 2023 | 146 |
| 2024 | 146 |