Year	Number of
1992	206300
1993	305600
1994	358500
1995	412600
1996	478400
1997	509800
1998	605000
1999	647900
2000	383400
2001	2264000
2002	2515000
2003	3143000
2004	5706000
2005	3362000
2006	3760000