| Year | Count |
|---|---|
| 1984 | 10 |
| 1986 | 5 |
| 1987 | 8 |
| 1988 | 9 |
| 1992 | 27 |
| 1993 | 14 |
| 1994 | 13 |
| 1995 | 46 |
| 1996 | 53 |
| 1997 | 47 |
| 1998 | 55 |
| 1999 | 54 |
| 2000 | 56 |
| 2001 | 115 |
| 2002 | 87 |
| 2003 | 107 |
| 2004 | 162 |
| 2005 | 225 |
| 2006 | 253 |
| 2007 | 194 |
| 2008 | 227 |
| 2009 | 139 |
| 2010 | 163 |
| 2011 | 166 |
| 2012 | 164 |
| 2013 | 100 |
| 2014 | 151 |
| 2015 | 277 |
| 2016 | 285 |
| 2017 | 307 |
| 2018 | 180 |
| 2019 | 130 |
| 2020 | 171 |
| 2021 | 215 |
| 2022 | 243 |
| 2023 | 176 |
| 2024 | 139 |