Year	2007 US$
1960	20.4
1961	25.8
1962	26.27
1963	34.23
1964	31.57
1965	35.26
1966	41.66
1967	41.31
1968	71.87
1969	76.11
1970	83.41
1971	88.5
1972	116.6
1973	127.1
1974	165.2
1975	199.8
1976	228.7
1977	278.8
1978	309.2
1979	341.2
1980	331.1
1981	326.7
1982	396.3
1983	436.1
1984	424.4
1985	450.7
1986	539.5
1987	509.3
1988	517.2
1989	480.9
1990	550.1
1991	542.6
1992	562.2
1993	497.6
1994	552.1
1995	524.4
1996	537.9
1997	567
1998	614
1999	612.7
2000	547.7
2001	583.6
2002	659
2003	680.1
2004	656.3
2005	726.9
2006	702.3
2007	786.5