| Year | Count |
|---|---|
| 1970 | 5 |
| 1971 | 6 |
| 1983 | 5 |
| 1986 | 16 |
| 1987 | 19 |
| 1988 | 31 |
| 1989 | 17 |
| 1990 | 65 |
| 1991 | 70 |
| 1992 | 60 |
| 1993 | 36 |
| 1994 | 33 |
| 1995 | 100 |
| 1996 | 118 |
| 1997 | 118 |
| 1998 | 162 |
| 1999 | 133 |
| 2000 | 248 |
| 2001 | 212 |
| 2002 | 208 |
| 2003 | 403 |
| 2004 | 523 |
| 2005 | 590 |
| 2006 | 555 |
| 2007 | 586 |
| 2008 | 575 |
| 2009 | 553 |
| 2010 | 438 |
| 2011 | 497 |
| 2012 | 573 |
| 2013 | 492 |
| 2014 | 635 |
| 2015 | 799 |
| 2015 | 6 |
| 2016 | 1,331 |
| 2016 | 10 |
| 2017 | 1,868 |
| 2018 | 1,851 |
| 2018 | 7 |
| 2019 | 2,307 |
| 2020 | 2,110 |
| 2021 | 2,250 |
| 2022 | 2,513 |
| 2023 | 2,706 |
| 2023 | 7 |
| 2024 | 2,629 |