| Year | Count |
|---|---|
| 1988 | 6 |
| 1990 | 8 |
| 1991 | 11 |
| 1992 | 7 |
| 1993 | 13 |
| 1994 | 23 |
| 1995 | 19 |
| 1996 | 19 |
| 1997 | 37 |
| 1998 | 35 |
| 1999 | 37 |
| 2000 | 28 |
| 2001 | 47 |
| 2002 | 55 |
| 2003 | 69 |
| 2004 | 74 |
| 2005 | 92 |
| 2006 | 119 |
| 2007 | 162 |
| 2008 | 7 |
| 2008 | 168 |
| 2009 | 151 |
| 2010 | 176 |
| 2011 | 176 |
| 2012 | 188 |
| 2013 | 178 |
| 2014 | 181 |
| 2015 | 176 |
| 2016 | 308 |
| 2017 | 324 |
| 2018 | 284 |
| 2019 | 10 |
| 2019 | 348 |
| 2020 | 151 |
| 2021 | 195 |
| 2022 | 10 |
| 2022 | 188 |
| 2023 | 14 |
| 2023 | 186 |
| 2024 | 10 |
| 2024 | 229 |