Year	Number of
1990	13860
1991	14840
1992	14900
1993	14840
1994	14900
1995	15710
1996	17420
1997	20090
1998	23750
1999	29330
2000	36120
2001	42910
2002	48080
2003	51800
2004	54960
2005	56060
2006	56310
2007	57390