| Year | Count |
|---|---|
| 1976 | 8 |
| 1978 | 12 |
| 1979 | 12 |
| 1982 | 5 |
| 1989 | 7 |
| 1990 | 7 |
| 1993 | 7 |
| 1994 | 5 |
| 1995 | 11 |
| 1996 | 10 |
| 1997 | 6 |
| 1998 | 9 |
| 1999 | 55 |
| 2000 | 183 |
| 2001 | 176 |
| 2002 | 153 |
| 2003 | 181 |
| 2004 | 204 |
| 2005 | 195 |
| 2006 | 164 |
| 2007 | 148 |
| 2008 | 125 |
| 2009 | 118 |
| 2010 | 127 |
| 2011 | 120 |
| 2012 | 90 |
| 2013 | 94 |
| 2014 | 62 |
| 2015 | 81 |
| 2016 | 252 |
| 2017 | 144 |
| 2018 | 124 |
| 2019 | 110 |
| 2020 | 104 |
| 2021 | 84 |
| 2022 | 78 |
| 2023 | 68 |
| 2024 | 54 |