| Year | Count |
|---|---|
| 1974 | 5 |
| 1981 | 11 |
| 1984 | 6 |
| 1986 | 5 |
| 1988 | 12 |
| 1992 | 22 |
| 1993 | 51 |
| 1994 | 86 |
| 1995 | 83 |
| 1996 | 83 |
| 1997 | 94 |
| 1998 | 69 |
| 1999 | 83 |
| 2000 | 106 |
| 2001 | 122 |
| 2002 | 99 |
| 2003 | 58 |
| 2004 | 59 |
| 2005 | 93 |
| 2006 | 77 |
| 2007 | 96 |
| 2008 | 181 |
| 2009 | 160 |
| 2010 | 156 |
| 2011 | 148 |
| 2012 | 278 |
| 2013 | 233 |
| 2014 | 264 |
| 2015 | 356 |
| 2016 | 346 |
| 2017 | 245 |
| 2018 | 243 |
| 2019 | 200 |
| 2020 | 164 |
| 2021 | 211 |
| 2022 | 183 |
| 2023 | 199 |
| 2024 | 170 |