| Year | Count |
|---|---|
| 1977 | 8 |
| 1984 | 6 |
| 1986 | 6 |
| 1988 | 10 |
| 1988 | 5 |
| 1989 | 6 |
| 1991 | 11 |
| 1992 | 22 |
| 1993 | 10 |
| 1993 | 6 |
| 1994 | 10 |
| 1994 | 5 |
| 1995 | 7 |
| 1995 | 26 |
| 1996 | 17 |
| 1997 | 16 |
| 1997 | 25 |
| 1998 | 21 |
| 1998 | 29 |
| 1999 | 12 |
| 1999 | 25 |
| 2000 | 42 |
| 2001 | 71 |
| 2002 | 6 |
| 2002 | 30 |
| 2003 | 35 |
| 2004 | 49 |
| 2005 | 47 |
| 2006 | 69 |
| 2007 | 70 |
| 2008 | 115 |
| 2009 | 37 |
| 2009 | 93 |
| 2010 | 78 |
| 2011 | 101 |
| 2012 | 468 |
| 2013 | 12 |
| 2013 | 642 |
| 2014 | 5 |
| 2014 | 335 |
| 2015 | 402 |
| 2016 | 6 |
| 2016 | 386 |
| 2017 | 220 |
| 2018 | 200 |
| 2019 | 202 |
| 2020 | 151 |
| 2021 | 245 |
| 2022 | 200 |
| 2023 | 234 |
| 2024 | 213 |