| Year | Count |
|---|---|
| 1983 | 10 |
| 1984 | 18 |
| 1985 | 52 |
| 1986 | 14 |
| 1987 | 16 |
| 1988 | 12 |
| 1989 | 8 |
| 1989 | 52 |
| 1990 | 5 |
| 1990 | 36 |
| 1991 | 68 |
| 1992 | 6 |
| 1992 | 67 |
| 1993 | 71 |
| 1994 | 122 |
| 1995 | 159 |
| 1996 | 160 |
| 1997 | 158 |
| 1998 | 12 |
| 1998 | 186 |
| 1999 | 214 |
| 2000 | 193 |
| 2001 | 268 |
| 2002 | 173 |
| 2003 | 87 |
| 2004 | 169 |
| 2005 | 5 |
| 2005 | 163 |
| 2006 | 206 |
| 2007 | 143 |
| 2008 | 154 |
| 2009 | 10 |
| 2009 | 137 |
| 2010 | 160 |
| 2011 | 199 |
| 2012 | 138 |
| 2013 | 12 |
| 2013 | 118 |
| 2014 | 101 |
| 2015 | 7 |
| 2015 | 139 |
| 2016 | 128 |
| 2017 | 5 |
| 2017 | 110 |
| 2018 | 105 |
| 2019 | 102 |
| 2020 | 84 |
| 2021 | 112 |
| 2022 | 83 |
| 2023 | 86 |
| 2024 | 83 |