Year	Number of
1990	905
1991	1525
1992	2366
1993	3470
1994	4738
1995	6070
1996	7265
1997	8488
1998	9683
1999	10910
2000	12230
2001	13510
2002	14690
2003	15540
2004	15910
2005	15880
2006	15620
2007	15350