| Year | Count |
|---|---|
| 1980 | 5 |
| 1981 | 5 |
| 1984 | 5 |
| 1987 | 10 |
| 1989 | 44 |
| 1990 | 10 |
| 1991 | 69 |
| 1992 | 119 |
| 1993 | 212 |
| 1994 | 231 |
| 1995 | 281 |
| 1996 | 474 |
| 1997 | 404 |
| 1998 | 811 |
| 1999 | 776 |
| 2000 | 678 |
| 2001 | 690 |
| 2002 | 733 |
| 2003 | 858 |
| 2004 | 1,349 |
| 2005 | 1,208 |
| 2006 | 1,197 |
| 2007 | 1,258 |
| 2008 | 1,373 |
| 2009 | 1,313 |
| 2010 | 1,423 |
| 2011 | 1,479 |
| 2012 | 1,554 |
| 2013 | 1,380 |
| 2014 | 1,338 |
| 2015 | 1,228 |
| 2016 | 1,221 |
| 2017 | 1,117 |
| 2018 | 966 |
| 2019 | 1,035 |
| 2020 | 869 |
| 2021 | 803 |
| 2022 | 770 |
| 2023 | 628 |
| 2024 | 520 |