| Year | Count |
|---|---|
| 1981 | 246 |
| 1982 | 688 |
| 1983 | 636 |
| 1984 | 474 |
| 1985 | 502 |
| 1986 | 445 |
| 1987 | 267 |
| 1988 | 207 |
| 1989 | 161 |
| 1990 | 165 |
| 1991 | 163 |
| 1992 | 237 |
| 1993 | 185 |
| 1994 | 150 |
| 1995 | 123 |
| 1996 | 124 |
| 1997 | 188 |
| 1998 | 170 |
| 1999 | 106 |
| 2000 | 99 |
| 2001 | 145 |
| 2002 | 67 |
| 2003 | 103 |
| 2004 | 132 |
| 2005 | 134 |
| 2006 | 156 |
| 2007 | 218 |
| 2008 | 184 |
| 2009 | 144 |
| 2010 | 172 |
| 2011 | 172 |
| 2012 | 154 |
| 2013 | 168 |
| 2014 | 231 |
| 2015 | 232 |
| 2015 | 6 |
| 2016 | 227 |
| 2017 | 180 |
| 2018 | 190 |
| 2019 | 258 |
| 2020 | 327 |
| 2021 | 417 |
| 2022 | 465 |
| 2023 | 515 |
| 2024 | 419 |