| Year | Count |
|---|---|
| 1984 | 5 |
| 1986 | 5 |
| 1987 | 6 |
| 1988 | 90 |
| 1989 | 212 |
| 1990 | 264 |
| 1991 | 294 |
| 1992 | 359 |
| 1993 | 470 |
| 1994 | 352 |
| 1995 | 411 |
| 1996 | 455 |
| 1997 | 500 |
| 1998 | 456 |
| 1999 | 421 |
| 2000 | 416 |
| 2001 | 453 |
| 2002 | 411 |
| 2003 | 441 |
| 2004 | 454 |
| 2005 | 462 |
| 2006 | 618 |
| 2007 | 705 |
| 2008 | 886 |
| 2009 | 962 |
| 2010 | 877 |
| 2011 | 924 |
| 2012 | 901 |
| 2013 | 773 |
| 2014 | 733 |
| 2015 | 707 |
| 2016 | 588 |
| 2017 | 436 |
| 2018 | 423 |
| 2019 | 420 |
| 2020 | 375 |
| 2021 | 298 |
| 2022 | 204 |
| 2023 | 229 |
| 2024 | 248 |