| Year | Count |
|---|---|
| 1991 | 10 |
| 1992 | 61 |
| 1993 | 10 |
| 1994 | 32 |
| 1995 | 42 |
| 1996 | 8 |
| 1996 | 74 |
| 1997 | 86 |
| 1998 | 94 |
| 1999 | 5 |
| 1999 | 143 |
| 2000 | 28 |
| 2000 | 216 |
| 2001 | 12 |
| 2001 | 256 |
| 2002 | 18 |
| 2002 | 230 |
| 2003 | 389 |
| 2004 | 12 |
| 2004 | 329 |
| 2005 | 10 |
| 2005 | 318 |
| 2006 | 15 |
| 2006 | 430 |
| 2007 | 50 |
| 2007 | 582 |
| 2008 | 38 |
| 2008 | 669 |
| 2009 | 38 |
| 2009 | 571 |
| 2010 | 45 |
| 2010 | 570 |
| 2011 | 5 |
| 2011 | 485 |
| 2012 | 20 |
| 2012 | 495 |
| 2013 | 45 |
| 2013 | 381 |
| 2014 | 10 |
| 2014 | 365 |
| 2015 | 35 |
| 2015 | 338 |
| 2016 | 7 |
| 2016 | 329 |
| 2017 | 8 |
| 2017 | 273 |
| 2018 | 6 |
| 2018 | 252 |
| 2019 | 10 |
| 2019 | 169 |
| 2020 | 122 |
| 2021 | 5 |
| 2021 | 60 |
| 2022 | 79 |
| 2023 | 44 |
| 2024 | 14 |
| 2024 | 36 |