| Year | Count |
|---|---|
| 1968 | 18 |
| 1973 | 15 |
| 1974 | 5 |
| 1977 | 14 |
| 1991 | 5 |
| 1996 | 5 |
| 1997 | 207 |
| 1998 | 354 |
| 1999 | 299 |
| 2000 | 199 |
| 2001 | 197 |
| 2002 | 177 |
| 2003 | 183 |
| 2004 | 213 |
| 2005 | 204 |
| 2006 | 167 |
| 2007 | 174 |
| 2008 | 171 |
| 2009 | 265 |
| 2010 | 168 |
| 2011 | 59 |
| 2012 | 60 |
| 2013 | 43 |
| 2014 | 44 |
| 2015 | 282 |
| 2016 | 259 |
| 2017 | 171 |
| 2018 | 82 |
| 2019 | 124 |
| 2020 | 129 |
| 2021 | 57 |
| 2022 | 48 |
| 2023 | 54 |
| 2024 | 26 |