| Year | Count |
|---|---|
| 1984 | 5 |
| 1985 | 10 |
| 1986 | 26 |
| 1987 | 28 |
| 1988 | 39 |
| 1989 | 28 |
| 1990 | 50 |
| 1991 | 66 |
| 1992 | 69 |
| 1993 | 74 |
| 1994 | 89 |
| 1995 | 97 |
| 1996 | 114 |
| 1997 | 96 |
| 1998 | 123 |
| 1999 | 186 |
| 2000 | 158 |
| 2001 | 163 |
| 2002 | 171 |
| 2003 | 210 |
| 2004 | 195 |
| 2005 | 228 |
| 2006 | 222 |
| 2007 | 250 |
| 2008 | 247 |
| 2009 | 334 |
| 2010 | 303 |
| 2011 | 323 |
| 2012 | 348 |
| 2013 | 307 |
| 2014 | 249 |
| 2015 | 253 |
| 2016 | 663 |
| 2017 | 603 |
| 2018 | 588 |
| 2019 | 326 |
| 2020 | 308 |
| 2021 | 290 |
| 2022 | 214 |
| 2023 | 208 |
| 2024 | 166 |