| Year | Count |
|---|---|
| 1991 | 6 |
| 1992 | 8 |
| 1994 | 15 |
| 1994 | 31 |
| 1995 | 6 |
| 1995 | 24 |
| 1996 | 10 |
| 1996 | 65 |
| 1997 | 57 |
| 1998 | 42 |
| 1998 | 61 |
| 1999 | 49 |
| 1999 | 66 |
| 2000 | 19 |
| 2000 | 121 |
| 2001 | 74 |
| 2001 | 168 |
| 2002 | 47 |
| 2002 | 101 |
| 2003 | 123 |
| 2003 | 94 |
| 2004 | 129 |
| 2004 | 123 |
| 2005 | 134 |
| 2005 | 96 |
| 2006 | 80 |
| 2006 | 104 |
| 2007 | 154 |
| 2007 | 135 |
| 2008 | 124 |
| 2008 | 98 |
| 2009 | 66 |
| 2009 | 110 |
| 2010 | 75 |
| 2010 | 127 |
| 2011 | 40 |
| 2011 | 126 |
| 2012 | 71 |
| 2012 | 75 |
| 2013 | 38 |
| 2013 | 57 |
| 2014 | 30 |
| 2014 | 70 |
| 2015 | 49 |
| 2015 | 57 |
| 2016 | 39 |
| 2016 | 10 |
| 2017 | 5 |
| 2017 | 6 |
| 2018 | 5 |
| 2018 | 10 |
| 2019 | 53 |
| 2020 | 5 |
| 2020 | 5 |
| 2021 | 28 |
| 2022 | 8 |
| 2022 | 15 |
| 2023 | 5 |