Year	Number of
1990	523
1991	865
1992	1314
1993	1887
1994	2522
1995	3161
1996	3740
1997	4420
1998	4866
1999	5265
2000	5671
2001	6118
2002	6147
2003	5787
2004	5785
2005	5066
2006	4675
2007	4434