Year	2007 US$
1960	175.7
1961	184.6
1962	181.1
1963	145.1
1964	139.3
1965	122
1966	116.8
1967	124.6
1968	123.5
1969	135
1970	103.7
1971	105.7
1972	107
1973	95.72
1974	101.2
1975	100.9
1976	96.7
1977	93.63
1978	96.36
1979	109.3
1980	115
1981	135.3
1982	149.6
1983	150.3
1984	166.4
1985	167.1
1986	157.1
1987	171.3
1988	170.6
1989	186.8
1990	190.8
1991	197.5
1992	202.2
1993	202.8
1994	209
1995	184.1
1996	163.2
1997	155.4
1998	142.3
1999	145.2
2000	119.9
2001	123.1
2002	148.7
2003	160.1
2004	161.4
2005	191
2006	186.8
2007	160.2