Year	Total
1971	1019000000
1972	1112000000
1973	1166000000
1974	1224000000
1975	1311000000
1976	1401000000
1977	1581000000
1978	1763000000
1979	1975000000
1980	2117000000
1981	2042000000
1982	2229000000
1983	2344000000
1984	2485000000
1985	2682000000
1986	2900000000
1987	2913000000
1988	3065000000
1989	3253000000
1990	3307000000
1991	3246000000
1992	3002000000
1993	2944000000
1994	3286000000
1995	3275000000
1996	3351000000
1997	3636000000
1998	3791000000
1999	3992000000
2000	4247000000
2001	4488000000
2002	4894000000
2003	5124000000
2004	5010000000
2005	5086000000
2006	5595000000
2007	6132000000
2008	6054000000