| Year | Count |
|---|---|
| 1989 | 6 |
| 1993 | 5 |
| 1994 | 15 |
| 1994 | 41 |
| 1995 | 45 |
| 1995 | 68 |
| 1996 | 36 |
| 1996 | 56 |
| 1997 | 33 |
| 1997 | 92 |
| 1998 | 67 |
| 1998 | 86 |
| 1999 | 53 |
| 1999 | 101 |
| 2000 | 51 |
| 2000 | 108 |
| 2001 | 71 |
| 2001 | 297 |
| 2002 | 89 |
| 2002 | 275 |
| 2003 | 156 |
| 2003 | 392 |
| 2004 | 279 |
| 2004 | 463 |
| 2005 | 310 |
| 2005 | 575 |
| 2006 | 381 |
| 2006 | 774 |
| 2007 | 448 |
| 2007 | 694 |
| 2008 | 456 |
| 2008 | 796 |
| 2009 | 350 |
| 2009 | 921 |
| 2010 | 414 |
| 2010 | 821 |
| 2011 | 494 |
| 2011 | 705 |
| 2012 | 607 |
| 2012 | 914 |
| 2013 | 638 |
| 2013 | 892 |
| 2014 | 645 |
| 2014 | 1,008 |
| 2015 | 834 |
| 2015 | 1,524 |
| 2016 | 871 |
| 2016 | 1,621 |
| 2017 | 1,082 |
| 2017 | 1,699 |
| 2018 | 892 |
| 2018 | 1,838 |
| 2019 | 1,174 |
| 2019 | 1,835 |
| 2020 | 1,185 |
| 2020 | 1,616 |
| 2021 | 1,219 |
| 2021 | 1,669 |
| 2022 | 1,279 |
| 2022 | 1,517 |
| 2023 | 1,134 |
| 2023 | 1,336 |
| 2024 | 823 |
| 2024 | 1,288 |