| Year | Count |
|---|---|
| 1983 | 5 |
| 1984 | 17 |
| 1985 | 572 |
| 1986 | 854 |
| 1987 | 1,006 |
| 1988 | 958 |
| 1989 | 1,151 |
| 1989 | 5 |
| 1990 | 1,269 |
| 1990 | 7 |
| 1991 | 1,555 |
| 1992 | 1,244 |
| 1993 | 1,759 |
| 1994 | 1,728 |
| 1995 | 1,902 |
| 1996 | 1,929 |
| 1997 | 2,072 |
| 1998 | 2,229 |
| 1999 | 1,776 |
| 2000 | 1,554 |
| 2001 | 1,480 |
| 2002 | 1,308 |
| 2003 | 1,237 |
| 2004 | 1,230 |
| 2004 | 10 |
| 2005 | 1,030 |
| 2006 | 623 |
| 2007 | 502 |
| 2008 | 413 |
| 2009 | 236 |
| 2010 | 256 |
| 2011 | 143 |
| 2012 | 141 |
| 2013 | 88 |
| 2014 | 93 |
| 2015 | 48 |
| 2016 | 27 |
| 2017 | 5 |
| 2018 | 11 |
| 2019 | 7 |
| 2021 | 8 |
| 2022 | 20 |
| 2023 | 5 |
| 2024 | 7 |