| Year | Count |
|---|---|
| 1978 | 5 |
| 1979 | 7 |
| 1980 | 5 |
| 1986 | 38 |
| 1987 | 98 |
| 1988 | 91 |
| 1989 | 130 |
| 1990 | 228 |
| 1991 | 267 |
| 1992 | 273 |
| 1993 | 270 |
| 1994 | 343 |
| 1995 | 396 |
| 1996 | 420 |
| 1997 | 571 |
| 1998 | 996 |
| 1999 | 698 |
| 2000 | 959 |
| 2001 | 1,090 |
| 2002 | 1,107 |
| 2003 | 1,273 |
| 2004 | 1,592 |
| 2004 | 12 |
| 2005 | 1,727 |
| 2006 | 1,681 |
| 2006 | 5 |
| 2007 | 1,630 |
| 2008 | 1,458 |
| 2009 | 1,304 |
| 2010 | 994 |
| 2011 | 1,195 |
| 2012 | 1,184 |
| 2013 | 1,111 |
| 2014 | 1,034 |
| 2015 | 1,103 |
| 2016 | 1,258 |
| 2017 | 1,167 |
| 2018 | 870 |
| 2019 | 842 |
| 2020 | 781 |
| 2021 | 736 |
| 2022 | 767 |
| 2023 | 708 |
| 2024 | 726 |