Year	Number of
1990	1911
1991	2785
1992	3886
1993	5370
1994	7229
1995	9513
1996	12040
1997	15130
1998	18640
1999	22600
2000	27050
2001	31660
2002	36120
2003	39830
2004	42140
2005	43280
2006	43590
2007	43680