| Year | Count |
|---|---|
| 1978 | 6 |
| 1982 | 7 |
| 1984 | 5 |
| 1986 | 5 |
| 1988 | 5 |
| 1989 | 9 |
| 1990 | 5 |
| 1991 | 12 |
| 1992 | 7 |
| 1994 | 15 |
| 1995 | 14 |
| 1996 | 13 |
| 1998 | 16 |
| 1999 | 66 |
| 2000 | 184 |
| 2001 | 200 |
| 2002 | 369 |
| 2003 | 393 |
| 2004 | 372 |
| 2005 | 416 |
| 2006 | 407 |
| 2007 | 451 |
| 2008 | 513 |
| 2009 | 518 |
| 2010 | 480 |
| 2011 | 484 |
| 2012 | 538 |
| 2013 | 432 |
| 2014 | 515 |
| 2015 | 740 |
| 2016 | 958 |
| 2017 | 1,110 |
| 2018 | 1,025 |
| 2019 | 986 |
| 2020 | 1,049 |
| 2021 | 1,419 |
| 2022 | 1,429 |
| 2023 | 1,823 |
| 2024 | 1,689 |