Year	2007 US$
1960	16.26
1961	23.71
1962	20.39
1963	22.18
1964	24.5
1965	29.17
1966	43.84
1967	51.88
1968	57.93
1969	102.3
1970	101.1
1971	116.4
1972	127.8
1973	135.9
1974	154
1975	156.3
1976	156.7
1977	171.2
1978	216.3
1979	228.3
1980	235.5
1981	226.1
1982	247.2
1983	240.9
1984	292.5
1985	281
1986	329.8
1987	328.3
1988	333.4
1989	350.8
1990	359.7
1991	370.3
1992	397.3
1993	406.4
1994	422.2
1995	410.6
1996	452.4
1997	464.7
1998	483.1
1999	501.8
2000	540
2001	530.3
2002	492
2003	427.9
2004	442.9
2005	443.9
2006	455.4
2007	467.6