| Year | Count |
|---|---|
| 1983 | 5 |
| 1984 | 9 |
| 1985 | 12 |
| 1986 | 19 |
| 1987 | 49 |
| 1988 | 78 |
| 1989 | 221 |
| 1990 | 265 |
| 1991 | 325 |
| 1992 | 391 |
| 1993 | 1,057 |
| 1994 | 2,016 |
| 1995 | 2,453 |
| 1996 | 2,602 |
| 1997 | 3,332 |
| 1998 | 4,859 |
| 1999 | 4,125 |
| 2000 | 3,389 |
| 2001 | 3,203 |
| 2002 | 2,914 |
| 2003 | 2,622 |
| 2004 | 2,784 |
| 2005 | 3,099 |
| 2006 | 2,750 |
| 2007 | 2,309 |
| 2008 | 2,263 |
| 2009 | 1,974 |
| 2010 | 1,806 |
| 2011 | 1,718 |
| 2012 | 1,447 |
| 2013 | 1,249 |
| 2014 | 1,019 |
| 2015 | 1,026 |
| 2016 | 1,009 |
| 2017 | 960 |
| 2018 | 826 |
| 2019 | 641 |
| 2020 | 559 |
| 2021 | 417 |
| 2022 | 532 |
| 2023 | 506 |
| 2024 | 318 |