Year	Number of
1990	555
1991	771
1992	1076
1993	1468
1994	1991
1995	2645
1996	3482
1997	4453
1998	5535
1999	6691
2000	7832
2001	8926
2002	9903
2003	10730
2004	11400
2005	11930
2006	12330
2007	12350