Year	Number of
1990	989000
1991	939300
1992	789700
1993	702200
1994	701000
1995	656500
1996	664500
1997	568300
1998	548100
1999	121000
2001	574400
2002	721700
2003	716800
2004	602900
2005	506000
2006	475300