| Year | Count |
|---|---|
| 1987 | 10 |
| 1989 | 40 |
| 1990 | 28 |
| 1991 | 32 |
| 1992 | 56 |
| 1993 | 40 |
| 1994 | 87 |
| 1995 | 52 |
| 1996 | 84 |
| 1997 | 118 |
| 1998 | 131 |
| 1999 | 118 |
| 2000 | 143 |
| 2001 | 151 |
| 2002 | 383 |
| 2003 | 543 |
| 2004 | 685 |
| 2005 | 704 |
| 2006 | 769 |
| 2007 | 808 |
| 2008 | 684 |
| 2009 | 727 |
| 2010 | 755 |
| 2011 | 838 |
| 2012 | 947 |
| 2013 | 798 |
| 2014 | 810 |
| 2015 | 941 |
| 2016 | 952 |
| 2017 | 982 |
| 2018 | 864 |
| 2019 | 954 |
| 2020 | 892 |
| 2021 | 946 |
| 2022 | 905 |
| 2023 | 778 |
| 2024 | 692 |