Year	Number of
1990	477
1991	688
1992	973
1993	1338
1994	1785
1995	2299
1996	2855
1997	3422
1998	3960
1999	4448
2000	4882
2001	5257
2002	5581
2003	5868
2004	6126
2005	6369
2006	6609
2007	6840