Year	Number of
1990	3577
1991	4080
1992	4488
1993	4955
1994	5440
1995	5979
1996	6485
1997	7145
1998	7909
1999	8813
2000	9895
2001	11050
2002	12210
2003	13180
2004	13780
2005	14070
2006	14160
2007	14230