| Year | Count |
|---|---|
| 1984 | 37 |
| 1985 | 274 |
| 1986 | 517 |
| 1987 | 684 |
| 1988 | 594 |
| 1989 | 702 |
| 1990 | 680 |
| 1991 | 807 |
| 1992 | 733 |
| 1993 | 870 |
| 1994 | 726 |
| 1995 | 639 |
| 1996 | 592 |
| 1997 | 645 |
| 1998 | 586 |
| 1999 | 556 |
| 2000 | 440 |
| 2001 | 437 |
| 2002 | 277 |
| 2003 | 278 |
| 2004 | 328 |
| 2005 | 380 |
| 2006 | 252 |
| 2007 | 95 |
| 2008 | 90 |
| 2009 | 53 |
| 2010 | 72 |
| 2011 | 27 |
| 2012 | 10 |
| 2014 | 10 |