Year	Number of
1990	2409
1991	3364
1992	4332
1993	5366
1994	6373
1995	7359
1996	8404
1997	9600
1998	10860
1999	12320
2000	14220
2001	17230
2002	16630
2003	16940
2004	16670
2005	16310
2006	15170
2007	14090