Year	Total
1960	2450000000
1961	2665000000
1962	2859000000
1963	3215000000
1964	3438000000
1965	3786000000
1966	4054000000
1967	4154000000
1968	5874000000
1969	6113000000
1970	6421000000
1971	6815000000
1972	7385000000
1973	7440000000
1974	7553000000
1975	8405000000
1976	8400000000
1977	8315000000
1978	8182000000
1979	7910000000
1980	8036000000
1981	8266000000
1982	8735000000
1983	8983000000
1984	9000000000
1985	9082000000
1986	9426000000
1987	9425000000
1988	9512000000
1989	9826000000
1990	10270000000
1991	10480000000
1992	10130000000
1993	10260000000
1994	10380000000
1995	10650000000
1996	10870000000
1997	11030000000
1998	11150000000
1999	11220000000
2000	11340000000
2001	11570000000
2002	11690000000
2003	12060000000
2004	12310000000
2005	12170000000
2006	12660000000
2007	12450000000
2008	12430000000