| Year | Count |
|---|---|
| 1975 | 5 |
| 1976 | 6 |
| 1978 | 6 |
| 1980 | 6 |
| 1984 | 13 |
| 1987 | 12 |
| 1988 | 32 |
| 1989 | 5 |
| 1994 | 21 |
| 1995 | 19 |
| 1996 | 24 |
| 1997 | 8 |
| 1998 | 6 |
| 1999 | 20 |
| 2000 | 15 |
| 2001 | 19 |
| 2002 | 27 |
| 2003 | 63 |
| 2004 | 74 |
| 2005 | 131 |
| 2006 | 125 |
| 2007 | 186 |
| 2008 | 177 |
| 2009 | 264 |
| 2010 | 350 |
| 2011 | 458 |
| 2012 | 579 |
| 2013 | 580 |
| 2014 | 851 |
| 2015 | 1,140 |
| 2016 | 1,248 |
| 2017 | 1,354 |
| 2018 | 1,697 |
| 2019 | 1,859 |
| 2020 | 1,745 |
| 2021 | 2,192 |
| 2021 | 6 |
| 2022 | 2,328 |
| 2023 | 2,140 |
| 2023 | 5 |
| 2024 | 2,539 |