Year	Number of
1990	4704
1991	4999
1992	5088
1993	5194
1994	5298
1995	5466
1996	5389
1997	5722
1998	6200
1999	7022
2000	7699
2001	8710
2002	9506
2003	10520
2004	10860
2005	11000
2006	11540
2007	11710