Year	Number of
1990	10320
1991	12740
1992	17430
1993	23090
1994	29980
1995	37090
1996	44680
1997	53900
1998	62630
1999	70290
2000	74930
2001	75500
2002	77190
2003	79700
2004	79800
2005	72860
2006	66360
2007	63340