Year	2007 US$
1960	47.05
1961	70.19
1962	73.5
1963	67.6
1964	76.42
1965	72.75
1966	64.17
1967	76.24
1968	81.4
1969	79.17
1970	69.93
1971	75.48
1972	71.88
1973	76.6
1974	89.83
1975	95.8
1976	89.57
1977	86.05
1978	97.8
1979	124.4
1980	123.3
1981	130.9
1982	133.1
1983	137.2
1984	131.8
1985	141.4
1986	131.5
1987	122.5
1988	126.3
1989	136.8
1990	142.8
1991	124
1992	121.5
1993	112.9
1994	105.8
1995	100.9
1996	106.2
1997	93.85
1998	90.25
1999	92.67
2000	98.23
2001	98.95
2002	98.71
2003	103.7
2004	103.7
2005	137.8
2006	140.6
2007	149.4