Year	2007 US$
1960	92.84
1961	100.4
1962	88.37
1963	85.35
1964	97.67
1965	87.74
1966	86.17
1967	85.21
1968	79.69
1969	86.28
1970	80.57
1971	92.88
1972	90.61
1973	82.56
1974	91.3
1975	87.25
1976	91.29
1977	104.2
1978	111.6
1979	129.7
1980	84.85
1981	104.1
1982	91.67
1983	89.46
1984	86.3
1985	90.19
1986	86.44
1987	79.01
1988	96.34
1989	95.15
1990	82.66
1991	94.44
1992	92.36
1993	94.21
1994	99.24
1995	93.55
1996	90.9
1997	90.11
1998	97.7
1999	87.94
2000	121.8
2001	126.9
2002	127.1
2003	143.4
2004	155.3
2005	208.7
2006	231.5
2007	162.6