| Year | Count |
|---|---|
| 1988 | 10 |
| 1992 | 5 |
| 1995 | 10 |
| 1997 | 10 |
| 1998 | 16 |
| 1999 | 23 |
| 2000 | 10 |
| 2001 | 17 |
| 2002 | 6 |
| 2003 | 54 |
| 2004 | 47 |
| 2005 | 43 |
| 2006 | 39 |
| 2007 | 43 |
| 2008 | 29 |
| 2009 | 116 |
| 2010 | 42 |
| 2011 | 74 |
| 2012 | 62 |
| 2013 | 102 |
| 2014 | 77 |
| 2015 | 120 |
| 2016 | 115 |
| 2017 | 124 |
| 2018 | 35 |
| 2019 | 30 |
| 2020 | 40 |
| 2021 | 94 |
| 2022 | 104 |
| 2023 | 75 |
| 2024 | 52 |