| Year | Count |
|---|---|
| 1975 | 25 |
| 1977 | 5 |
| 1979 | 5 |
| 1985 | 12 |
| 1987 | 18 |
| 1988 | 9 |
| 1991 | 10 |
| 1992 | 36 |
| 1993 | 45 |
| 1994 | 45 |
| 1995 | 55 |
| 1996 | 35 |
| 1997 | 50 |
| 1998 | 229 |
| 1999 | 706 |
| 2000 | 567 |
| 2001 | 486 |
| 2002 | 398 |
| 2003 | 384 |
| 2004 | 429 |
| 2005 | 503 |
| 2006 | 507 |
| 2007 | 430 |
| 2008 | 432 |
| 2009 | 316 |
| 2010 | 297 |
| 2011 | 440 |
| 2012 | 487 |
| 2013 | 518 |
| 2014 | 636 |
| 2015 | 1,083 |
| 2016 | 1,133 |
| 2017 | 1,083 |
| 2018 | 913 |
| 2019 | 952 |
| 2020 | 857 |
| 2021 | 776 |
| 2022 | 835 |
| 2023 | 789 |
| 2024 | 710 |