| Year | Count |
|---|---|
| 1982 | 11 |
| 1983 | 8 |
| 1984 | 43 |
| 1985 | 101 |
| 1986 | 166 |
| 1987 | 266 |
| 1988 | 617 |
| 1989 | 719 |
| 1990 | 937 |
| 1991 | 1,179 |
| 1992 | 1,120 |
| 1993 | 1,334 |
| 1994 | 1,428 |
| 1995 | 1,566 |
| 1996 | 1,440 |
| 1997 | 1,552 |
| 1998 | 1,598 |
| 1999 | 1,248 |
| 2000 | 1,043 |
| 2001 | 952 |
| 2002 | 709 |
| 2003 | 625 |
| 2004 | 693 |
| 2005 | 625 |
| 2006 | 461 |
| 2007 | 323 |
| 2008 | 251 |
| 2009 | 181 |
| 2010 | 151 |
| 2011 | 59 |
| 2012 | 45 |
| 2013 | 5 |
| 2014 | 19 |
| 2015 | 12 |
| 2019 | 11 |