Year	Number of
1990	34700
1991	32940
1992	34770
1993	36790
1994	38390
1995	39950
1996	44010
1997	46960
1998	51920
1999	53940
2000	58620
2001	62170
2002	63650
2003	64160
2004	62420
2005	52930
2006	46200
2007	47010