Year	Number of
1990	10250
1991	8800
1992	6199
1993	4428
1994	4814
1995	6099
1996	7818
1997	8364
1998	9571
1999	10280
2000	11820
2001	13790
2002	15650
2003	16330
2004	17910
2005	18470
2006	20010
2007	21680