Year	Number of
1990	3822
1991	3900
1992	3977
1993	4052
1994	4125
1995	4197
1996	4268
1997	4337
1998	4406
1999	4473
2000	4539
2001	4605
2002	4670
2003	4735
2004	4800
2005	4864
2006	4929
2007	4994