Year	Total
1971	1058000000
1972	1193000000
1973	1322000000
1974	1393000000
1975	1529000000
1976	1650000000
1977	1928000000
1978	2044000000
1979	2098000000
1980	2337000000
1981	2425000000
1982	2562000000
1983	2968000000
1984	3005000000
1985	3200000000
1986	3558000000
1987	3895000000
1988	4366000000
1989	4744000000
1990	5289000000
1991	5719000000
1992	6033000000
1993	6694000000
1994	7176000000
1995	7519000000
1996	8111000000
1997	8040000000
1998	9112000000
1999	8725000000
2000	8957000000
2001	9114000000
2002	9279000000
2003	9549000000
2004	9484000000
2005	9950000000
2006	9844000000
2007	10120000000
2008	10310000000