Year	Total
1990	900000
1991	1100000
1992	1200000
1993	1300000
1994	1600000
1995	2200000
1996	2600000
1997	3000000
1998	3500000
1999	4000000
2000	4500000
2001	5000000
2002	5556000
2003	6174000
2004	6861000
2005	7548000
2006	8000000