Year	Total
1990	500000
1991	650000
1992	950000
1993	1170000
1994	1700000
1995	2600000
1996	3500000
1997	4400000
1998	5100000
1999	5500000
2000	9300000
2001	11000000
2002	13000000
2003	13000000
2004	15000000
2005	17400000
2006	19000000