Year	Number of
1990	6903
1991	7240
1992	7587
1993	7946
1994	8319
1995	8707
1996	9111
1997	9530
1998	9966
1999	10420
2000	10890
2001	11380
2002	11890
2003	12420
2004	12960
2005	13530
2006	14110
2007	14710