| Year | Count |
|---|---|
| 1983 | 19 |
| 1984 | 37 |
| 1985 | 61 |
| 1986 | 21 |
| 1987 | 13 |
| 1988 | 11 |
| 1989 | 6 |
| 1993 | 97 |
| 1994 | 53 |
| 1995 | 13 |
| 1996 | 11 |
| 1997 | 52 |
| 1998 | 127 |
| 1999 | 152 |
| 2000 | 131 |
| 2001 | 281 |
| 2002 | 127 |
| 2003 | 145 |
| 2004 | 181 |
| 2005 | 203 |
| 2006 | 308 |
| 2007 | 137 |
| 2008 | 190 |
| 2009 | 106 |
| 2010 | 65 |
| 2011 | 65 |
| 2012 | 147 |
| 2013 | 166 |
| 2014 | 219 |
| 2015 | 230 |
| 2016 | 214 |
| 2017 | 257 |
| 2018 | 229 |
| 2019 | 187 |
| 2020 | 131 |
| 2021 | 146 |
| 2022 | 142 |
| 2023 | 111 |
| 2024 | 5 |
| 2024 | 145 |