| Year | Count |
|---|---|
| 1978 | 12 |
| 1979 | 16 |
| 1981 | 6 |
| 1982 | 7 |
| 1983 | 7 |
| 1984 | 6 |
| 1990 | 6 |
| 1991 | 6 |
| 1995 | 7 |
| 1997 | 8 |
| 1999 | 5 |
| 2000 | 6 |
| 2001 | 9 |
| 2002 | 7 |
| 2003 | 6 |
| 2004 | 8 |
| 2005 | 11 |
| 2006 | 16 |
| 2007 | 24 |
| 2008 | 19 |
| 2009 | 22 |
| 2010 | 23 |
| 2011 | 27 |
| 2012 | 22 |
| 2013 | 23 |
| 2014 | 31 |
| 2015 | 37 |
| 2016 | 174 |
| 2017 | 195 |
| 2018 | 207 |
| 2019 | 110 |
| 2020 | 90 |
| 2021 | 124 |
| 2022 | 118 |
| 2023 | 154 |
| 2024 | 126 |