| Year | Count |
|---|---|
| 1986 | 14 |
| 1987 | 15 |
| 1988 | 5 |
| 1989 | 7 |
| 1990 | 5 |
| 1991 | 8 |
| 1992 | 17 |
| 1993 | 33 |
| 1994 | 45 |
| 1995 | 80 |
| 1996 | 145 |
| 1997 | 140 |
| 1998 | 171 |
| 1999 | 234 |
| 2000 | 256 |
| 2001 | 5 |
| 2001 | 326 |
| 2002 | 226 |
| 2003 | 283 |
| 2004 | 314 |
| 2005 | 483 |
| 2006 | 10 |
| 2006 | 634 |
| 2007 | 760 |
| 2008 | 951 |
| 2009 | 1,071 |
| 2010 | 1,635 |
| 2011 | 2,124 |
| 2012 | 2,725 |
| 2013 | 10 |
| 2013 | 3,218 |
| 2014 | 7 |
| 2014 | 3,590 |
| 2015 | 15 |
| 2015 | 4,799 |
| 2016 | 5,958 |
| 2017 | 6 |
| 2017 | 6,464 |
| 2018 | 8 |
| 2018 | 6,323 |
| 2019 | 5,941 |
| 2020 | 8 |
| 2020 | 5,021 |
| 2021 | 5,080 |
| 2022 | 7 |
| 2022 | 4,444 |
| 2023 | 3,425 |
| 2024 | 3,224 |