| Year | Count |
|---|---|
| 1989 | 10 |
| 1991 | 5 |
| 1994 | 10 |
| 1997 | 72 |
| 1998 | 40 |
| 1999 | 76 |
| 2000 | 64 |
| 2001 | 106 |
| 2002 | 110 |
| 2003 | 179 |
| 2004 | 232 |
| 2005 | 373 |
| 2006 | 396 |
| 2007 | 496 |
| 2008 | 745 |
| 2009 | 871 |
| 2010 | 1,263 |
| 2010 | 5 |
| 2011 | 1,993 |
| 2012 | 2,354 |
| 2013 | 2,483 |
| 2014 | 2,856 |
| 2015 | 3,528 |
| 2016 | 4,173 |
| 2017 | 4,973 |
| 2018 | 4,649 |
| 2019 | 4,226 |
| 2020 | 4,259 |
| 2021 | 4,837 |
| 2022 | 4,669 |
| 2023 | 4,082 |
| 2024 | 3,697 |