| Year | Count |
|---|---|
| 1978 | 5 |
| 1980 | 5 |
| 1981 | 5 |
| 1982 | 12 |
| 1984 | 5 |
| 1989 | 5 |
| 1990 | 27 |
| 1991 | 22 |
| 1992 | 31 |
| 1993 | 66 |
| 1994 | 57 |
| 1995 | 44 |
| 1996 | 70 |
| 1997 | 129 |
| 1998 | 185 |
| 1999 | 226 |
| 2000 | 133 |
| 2001 | 171 |
| 2002 | 189 |
| 2003 | 169 |
| 2004 | 215 |
| 2005 | 305 |
| 2006 | 275 |
| 2007 | 348 |
| 2008 | 282 |
| 2009 | 208 |
| 2010 | 202 |
| 2011 | 244 |
| 2012 | 259 |
| 2013 | 224 |
| 2014 | 223 |
| 2015 | 318 |
| 2016 | 256 |
| 2017 | 283 |
| 2018 | 152 |
| 2019 | 168 |
| 2020 | 138 |
| 2021 | 155 |
| 2022 | 105 |
| 2023 | 116 |
| 2024 | 107 |