| Year | Count |
|---|---|
| 1975 | 5 |
| 1990 | 6 |
| 1991 | 6 |
| 1992 | 15 |
| 1993 | 8 |
| 1993 | 16 |
| 1994 | 9 |
| 1994 | 34 |
| 1995 | 17 |
| 1995 | 33 |
| 1996 | 28 |
| 1996 | 48 |
| 1997 | 28 |
| 1997 | 94 |
| 1998 | 26 |
| 1998 | 79 |
| 1999 | 52 |
| 1999 | 168 |
| 2000 | 52 |
| 2000 | 152 |
| 2001 | 21 |
| 2001 | 139 |
| 2002 | 25 |
| 2002 | 172 |
| 2003 | 14 |
| 2003 | 212 |
| 2004 | 17 |
| 2004 | 152 |
| 2005 | 5 |
| 2005 | 231 |
| 2006 | 31 |
| 2006 | 258 |
| 2007 | 27 |
| 2007 | 247 |
| 2008 | 41 |
| 2008 | 287 |
| 2009 | 27 |
| 2009 | 231 |
| 2010 | 16 |
| 2010 | 202 |
| 2011 | 5 |
| 2011 | 231 |
| 2012 | 5 |
| 2012 | 205 |
| 2013 | 7 |
| 2013 | 208 |
| 2014 | 243 |
| 2015 | 299 |
| 2016 | 381 |
| 2017 | 7 |
| 2017 | 398 |
| 2018 | 470 |
| 2019 | 647 |
| 2020 | 597 |
| 2021 | 784 |
| 2022 | 727 |
| 2023 | 747 |
| 2024 | 777 |