| Year | Count |
|---|---|
| 1973 | 6 |
| 1975 | 6 |
| 1979 | 5 |
| 1980 | 7 |
| 1982 | 5 |
| 1987 | 5 |
| 1988 | 10 |
| 1990 | 6 |
| 1991 | 5 |
| 1992 | 5 |
| 1993 | 5 |
| 1994 | 12 |
| 1995 | 9 |
| 1996 | 18 |
| 1997 | 12 |
| 1998 | 14 |
| 1999 | 27 |
| 2000 | 11 |
| 2001 | 9 |
| 2002 | 24 |
| 2003 | 13 |
| 2004 | 37 |
| 2005 | 21 |
| 2006 | 71 |
| 2007 | 85 |
| 2008 | 59 |
| 2009 | 75 |
| 2010 | 108 |
| 2011 | 95 |
| 2012 | 153 |
| 2013 | 122 |
| 2014 | 204 |
| 2015 | 232 |
| 2016 | 265 |
| 2017 | 320 |
| 2018 | 363 |
| 2019 | 311 |
| 2020 | 255 |
| 2021 | 349 |
| 2022 | 351 |
| 2023 | 413 |
| 2024 | 549 |