| Year | Count |
|---|---|
| 1985 | 16 |
| 1986 | 10 |
| 1986 | 8 |
| 1987 | 24 |
| 1988 | 20 |
| 1989 | 18 |
| 1990 | 8 |
| 1991 | 7 |
| 1992 | 6 |
| 1993 | 5 |
| 1995 | 9 |
| 1995 | 81 |
| 1996 | 16 |
| 1996 | 285 |
| 1997 | 285 |
| 1998 | 232 |
| 1999 | 175 |
| 2000 | 211 |
| 2001 | 220 |
| 2002 | 151 |
| 2003 | 201 |
| 2004 | 227 |
| 2005 | 214 |
| 2006 | 319 |
| 2007 | 307 |
| 2008 | 310 |
| 2009 | 382 |
| 2010 | 5 |
| 2010 | 416 |
| 2011 | 328 |
| 2012 | 434 |
| 2013 | 306 |
| 2014 | 289 |
| 2015 | 232 |
| 2016 | 275 |
| 2017 | 312 |
| 2018 | 311 |
| 2019 | 303 |
| 2020 | 226 |
| 2021 | 153 |
| 2022 | 142 |
| 2023 | 80 |
| 2024 | 66 |