Year	2007 US$
1960	24.62
1961	23.42
1962	16.45
1963	24.77
1964	28.49
1965	33.43
1966	62.37
1967	59.29
1968	55.84
1969	58.18
1970	83.36
1971	86.3
1972	94.92
1973	94.92
1974	110.4
1975	125.7
1976	110.7
1977	123.5
1978	131.6
1979	121.2
1980	110.5
1981	111.7
1982	105.4
1983	118.1
1984	135.3
1985	137.7
1986	139.9
1987	140.1
1988	152.9
1989	136.6
1990	136.8
1991	136
1992	135
1993	134
1994	130
1995	116.1
1996	97.57
1997	110.3
1998	98.19
1999	95.82
2000	93.18
2001	83.62
2002	108.2
2003	94.03
2004	107.3
2005	138.2
2007	123.3