| Year | Count |
|---|---|
| 1989 | 5 |
| 1991 | 25 |
| 1992 | 35 |
| 1993 | 34 |
| 1994 | 25 |
| 1995 | 56 |
| 1996 | 21 |
| 1997 | 72 |
| 1998 | 108 |
| 1999 | 88 |
| 2000 | 89 |
| 2001 | 124 |
| 2002 | 74 |
| 2003 | 178 |
| 2004 | 260 |
| 2005 | 262 |
| 2006 | 251 |
| 2007 | 261 |
| 2008 | 249 |
| 2009 | 170 |
| 2010 | 161 |
| 2011 | 156 |
| 2012 | 170 |
| 2013 | 146 |
| 2014 | 67 |
| 2015 | 66 |
| 2016 | 40 |
| 2017 | 36 |
| 2018 | 5 |
| 2019 | 21 |
| 2020 | 60 |
| 2021 | 49 |
| 2022 | 52 |
| 2023 | 81 |
| 2024 | 115 |