Year	2007 US$
1960	111.1
1961	99.92
1962	74.03
1963	81.59
1964	68.91
1965	92.32
1966	66.19
1967	74.21
1968	71.75
1969	91.05
1970	88.75
1971	100.2
1972	112.4
1973	112.6
1974	115.3
1975	134.6
1976	118.2
1977	111.2
1978	135.1
1979	144.1
1980	127.7
1981	149
1982	147.9
1983	150.4
1984	150.1
1985	145.6
1986	132.2
1987	136.5
1988	114.4
1989	136.7
1990	142.2
1991	131.5
1992	124.7
1993	119.7
1994	101.5
1995	125.2
1996	115.4
1997	110.1
1998	126.3
1999	112.8
2000	137.8
2001	146.6
2002	168.4
2003	237.8
2004	166.4
2005	217.1
2006	209.5
2007	184.6