| Year | Count |
|---|---|
| 1979 | 5 |
| 1980 | 8 |
| 1982 | 6 |
| 1983 | 7 |
| 1988 | 22 |
| 1990 | 18 |
| 1991 | 15 |
| 1992 | 9 |
| 1993 | 31 |
| 1994 | 19 |
| 1995 | 17 |
| 1996 | 11 |
| 1997 | 32 |
| 1998 | 38 |
| 1999 | 25 |
| 2000 | 25 |
| 2001 | 59 |
| 2002 | 57 |
| 2003 | 44 |
| 2004 | 34 |
| 2005 | 22 |
| 2006 | 78 |
| 2007 | 55 |
| 2008 | 32 |
| 2009 | 65 |
| 2010 | 49 |
| 2011 | 92 |
| 2012 | 99 |
| 2013 | 122 |
| 2014 | 116 |
| 2015 | 132 |
| 2016 | 151 |
| 2017 | 159 |
| 2018 | 162 |
| 2019 | 78 |
| 2020 | 101 |
| 2021 | 65 |
| 2022 | 87 |
| 2023 | 99 |
| 2024 | 110 |