Year	Number of
1990	8370
1991	12350
1992	17090
1993	23010
1994	29920
1995	37710
1996	45630
1997	54710
1998	64490
1999	75100
2000	86730
2001	98320
2002	109300
2003	117800
2004	122500
2005	124100
2006	123900
2007	123400