Year	Total
1990	150000
1991	230000
1992	410000
1993	500000
1994	640000
1995	610000
1996	760000
1997	1030000
1998	1360000
1999	1800000
2000	2200000
2001	3000000
2002	3600000
2003	4200000
2004	4900000
2005	5600000
2006	6040000