Year	Total
1960	1504000000
1961	1714000000
1962	2003000000
1963	2258000000
1964	2520000000
1965	2877000000
1966	3202000000
1967	3494000000
1968	3923000000
1969	4411000000
1970	4921000000
1971	5441000000
1972	6116000000
1973	7604000000
1974	8334000000
1975	9278000000
1976	10170000000
1977	11050000000
1978	11980000000
1979	12690000000
1980	13110000000
1981	13460000000
1982	13710000000
1983	14200000000
1984	14650000000
1985	15500000000
1986	15970000000
1987	16890000000
1988	17060000000
1989	17720000000
1990	18420000000
1991	19900000000
1992	20250000000
1993	21090000000
1994	21360000000
1995	22110000000
1996	23230000000
1997	22940000000
1998	23390000000
1999	23490000000
2000	23740000000
2001	24400000000
2002	25930000000
2003	26030000000
2004	26550000000
2005	26010000000
2006	22730000000
2007	21860000000
2008	19990000000