| Year | Count |
|---|---|
| 1987 | 5 |
| 1990 | 5 |
| 1991 | 6 |
| 1993 | 20 |
| 1996 | 7 |
| 1997 | 7 |
| 1998 | 50 |
| 1999 | 5 |
| 2000 | 5 |
| 2001 | 29 |
| 2002 | 16 |
| 2003 | 12 |
| 2004 | 50 |
| 2005 | 43 |
| 2006 | 57 |
| 2007 | 56 |
| 2008 | 76 |
| 2009 | 19 |
| 2010 | 64 |
| 2011 | 62 |
| 2012 | 42 |
| 2013 | 39 |
| 2014 | 26 |
| 2015 | 58 |
| 2016 | 50 |
| 2017 | 24 |
| 2018 | 61 |
| 2019 | 43 |
| 2020 | 41 |
| 2021 | 31 |
| 2022 | 25 |
| 2023 | 15 |
| 2024 | 21 |