Year	Number of
1990	159600
1991	178400
1992	191800
1993	207200
1994	223600
1995	243100
1996	245900
1997	253900
1998	275900
1999	313500
2000	337400
2001	384200
2002	416500
2003	450900
2004	471800
2005	483700
2006	489000
2007	481200