| Year | Count |
|---|---|
| 1991 | 5 |
| 1992 | 5 |
| 1994 | 6 |
| 1995 | 9 |
| 1996 | 20 |
| 1997 | 23 |
| 1998 | 25 |
| 1999 | 58 |
| 2000 | 47 |
| 2001 | 56 |
| 2002 | 99 |
| 2003 | 87 |
| 2004 | 68 |
| 2005 | 102 |
| 2006 | 97 |
| 2007 | 80 |
| 2008 | 101 |
| 2009 | 67 |
| 2010 | 56 |
| 2011 | 56 |
| 2012 | 65 |
| 2013 | 65 |
| 2014 | 62 |
| 2015 | 65 |
| 2016 | 128 |
| 2017 | 152 |
| 2018 | 142 |
| 2019 | 148 |
| 2020 | 71 |
| 2021 | 69 |
| 2022 | 69 |
| 2023 | 52 |
| 2024 | 53 |