Year	Number of
1990	3407
1991	3881
1992	4257
1993	4683
1994	5124
1995	5621
1996	6098
1997	6733
1998	7475
1999	8357
2000	9408
2001	10530
2002	11670
2003	12620
2004	13200
2005	13490
2006	13560
2007	13610