| Year | Count |
|---|---|
| 1979 | 5 |
| 1984 | 7 |
| 1987 | 10 |
| 1988 | 12 |
| 1992 | 33 |
| 1995 | 9 |
| 1996 | 21 |
| 1997 | 43 |
| 1998 | 30 |
| 1999 | 5 |
| 2000 | 37 |
| 2001 | 38 |
| 2003 | 17 |
| 2004 | 97 |
| 2005 | 99 |
| 2006 | 94 |
| 2007 | 105 |
| 2008 | 145 |
| 2009 | 78 |
| 2010 | 63 |
| 2011 | 84 |
| 2012 | 42 |
| 2013 | 41 |
| 2014 | 41 |
| 2015 | 80 |
| 2016 | 53 |
| 2017 | 96 |
| 2018 | 72 |
| 2019 | 89 |
| 2020 | 58 |
| 2021 | 135 |
| 2022 | 140 |
| 2023 | 123 |
| 2024 | 150 |