| Year | Count |
|---|---|
| 1984 | 5 |
| 1988 | 22 |
| 1989 | 37 |
| 1990 | 86 |
| 1991 | 121 |
| 1992 | 145 |
| 1993 | 195 |
| 1994 | 197 |
| 1995 | 195 |
| 1996 | 209 |
| 1997 | 248 |
| 1998 | 223 |
| 1999 | 124 |
| 2000 | 148 |
| 2001 | 172 |
| 2002 | 188 |
| 2003 | 152 |
| 2004 | 186 |
| 2005 | 228 |
| 2006 | 172 |
| 2007 | 198 |
| 2008 | 211 |
| 2009 | 110 |
| 2010 | 72 |
| 2011 | 63 |
| 2012 | 44 |
| 2013 | 16 |
| 2014 | 30 |
| 2015 | 15 |
| 2016 | 15 |
| 2017 | 13 |
| 2020 | 5 |
| 2021 | 12 |
| 2022 | 22 |
| 2023 | 11 |
| 2024 | 7 |