| Year | Count |
|---|---|
| 1984 | 6 |
| 1987 | 22 |
| 1990 | 149 |
| 1991 | 184 |
| 1992 | 208 |
| 1993 | 206 |
| 1994 | 256 |
| 1995 | 259 |
| 1996 | 272 |
| 1997 | 359 |
| 1998 | 506 |
| 1999 | 479 |
| 2000 | 526 |
| 2001 | 584 |
| 2002 | 421 |
| 2003 | 542 |
| 2004 | 613 |
| 2005 | 723 |
| 2006 | 549 |
| 2007 | 583 |
| 2008 | 585 |
| 2009 | 445 |
| 2010 | 443 |
| 2011 | 415 |
| 2012 | 369 |
| 2013 | 280 |
| 2014 | 239 |
| 2015 | 264 |
| 2016 | 169 |
| 2017 | 143 |
| 2018 | 130 |
| 2019 | 90 |
| 2020 | 101 |
| 2021 | 81 |
| 2022 | 37 |
| 2023 | 84 |
| 2024 | 130 |