Year	Total
1960	2794000000
1961	3096000000
1962	3554000000
1963	4036000000
1964	4436000000
1965	5021000000
1966	5705000000
1967	6234000000
1968	6971000000
1969	7749000000
1970	8666000000
1971	9329000000
1972	10010000000
1973	10960000000
1974	11240000000
1975	12440000000
1976	13510000000
1977	13630000000
1978	14360000000
1979	14960000000
1980	15150000000
1981	15150000000
1982	15000000000
1983	15310000000
1984	15850000000
1985	16000000000
1986	16200000000
1987	16600000000
1988	15500000000
1989	16000000000
1990	16500000000
1991	17100000000
1992	17500000000
1993	17900000000
1994	18500000000
1995	19700000000
1996	20010000000
1997	20410000000
1998	20810000000
1999	21360000000
2000	21810000000
2001	22110000000
2002	22820000000
2003	23330000000
2004	23540000000
2005	24240000000
2006	24840000000
2007	24300000000
2008	24800000000