Year	2007 US$
1960	7.759
1961	9.402
1962	19.76
1963	23.79
1964	32.15
1965	34.98
1966	48.8
1967	48.26
1968	55.99
1969	90.77
1970	83.31
1971	102.9
1972	111.5
1973	132.5
1974	179.5
1975	206.3
1976	205.6
1977	244.6
1978	225.8
1979	250.7
1980	214.7
1981	224
1982	275.8
1983	233.3
1984	229.9
1985	253.9
1986	255.5
1987	272.7
1988	275.1
1989	312.5
1990	291.8
1991	286.4
1992	315.6
1993	294.3
1994	289.9
1995	241.3
1996	263.6
1997	256.1
1998	240.6
1999	256
2000	308.7
2001	314.8
2002	350.2
2003	339.5
2004	346.2
2005	429.1
2006	487.5
2007	472.7