Year	Total
1960	6773000000
1961	7546000000
1962	8052000000
1963	8791000000
1964	9588000000
1965	10350000000
1966	11220000000
1967	12230000000
1968	13050000000
1969	14350000000
1970	15330000000
1971	16630000000
1972	17950000000
1973	18680000000
1974	19750000000
1975	22130000000
1976	23220000000
1977	25320000000
1978	26530000000
1979	28210000000
1980	28980000000
1981	30500000000
1982	32010000000
1983	32340000000
1984	33270000000
1985	32580000000
1986	34470000000
1987	35560000000
1988	36170000000
1989	36630000000
1990	38550000000
1991	39260000000
1992	39330000000
1993	40650000000
1994	40570000000
1995	42170000000
1996	43210000000
1997	44780000000
1998	46190000000
1999	47330000000
2000	48770000000
2001	49610000000
2002	51260000000
2003	50930000000
2004	53260000000
2005	55400000000
2006	56090000000
2007	56260000000
2008	58210000000