| Year | Count |
|---|---|
| 1984 | 6 |
| 1985 | 6 |
| 1986 | 7 |
| 1989 | 9 |
| 1991 | 5 |
| 1992 | 5 |
| 1993 | 5 |
| 1996 | 5 |
| 1997 | 5 |
| 1998 | 12 |
| 1999 | 5 |
| 2000 | 6 |
| 2001 | 14 |
| 2002 | 10 |
| 2003 | 56 |
| 2004 | 59 |
| 2005 | 81 |
| 2006 | 73 |
| 2007 | 190 |
| 2008 | 125 |
| 2009 | 393 |
| 2010 | 24 |
| 2010 | 884 |
| 2011 | 836 |
| 2012 | 921 |
| 2013 | 965 |
| 2014 | 920 |
| 2015 | 955 |
| 2016 | 784 |
| 2017 | 586 |
| 2018 | 488 |
| 2019 | 325 |
| 2020 | 321 |
| 2021 | 299 |
| 2022 | 262 |
| 2023 | 217 |
| 2024 | 219 |