Year	Number of
1990	3745
1991	4804
1992	5822
1993	6803
1994	7732
1995	8570
1996	9289
1997	9871
1998	10310
1999	10600
2000	10740
2001	10750
2002	10650
2003	10450
2004	10180
2005	9852
2006	9492
2007	9114