Year	Number of
1990	1216
1991	1756
1992	2099
1993	2306
1994	2458
1995	2595
1996	2744
1997	2908
1998	3092
1999	3292
2000	3501
2001	3715
2002	3925
2003	4134
2004	4339
2005	4541
2006	4747
2007	4963