Year	Number of
1990	3131
1991	2883
1992	2862
1993	2984
1994	3284
1995	3512
1996	3780
1997	4008
1998	4263
1999	4401
2000	4445
2001	4386
2002	4328
2003	4322
2004	4390
2005	4585
2006	4863
2007	5149