Year	Number of
1990	4341
1991	4044
1992	3976
1993	3937
1994	3986
1995	4424
1996	5117
1997	6267
1998	7624
1999	8809
2000	9487
2001	9798
2002	9930
2003	9962
2004	9736
2005	9336
2006	9116
2007	8896