Year	Number of
1990	810500
1991	780800
1992	634200
1993	561300
1994	328500
1996	352300
1997	366700
1998	368500
1999	412600
2000	398100
2001	498800
2002	583900
2003	490300
2004	516900
2005	437700
2006	566400