Year	2007 US$
1961	4.105
1962	4.541
1963	5.493
1964	4.727
1965	3.454
1966	5.583
1967	6.638
1968	8.121
1969	22.75
1970	11.15
1971	20.25
1972	28.17
1973	30.88
1974	33.49
1975	36.43
1976	35.51
1977	32.38
1978	34.35
1979	48.97
1980	52.38
1981	65.9
1982	72.04
1983	81.1
1984	93.14
1985	107.7
1986	124.3
1987	141.9
1988	175.1
1989	196.3
1990	198.1
1991	223.9
1992	169.7
1993	116.8
1994	85.76
1995	90.98
1996	100.3
1997	103.3
1998	107.2
1999	116.2
2000	116.4
2001	121.6
2002	135.3
2003	136.9
2004	149.4
2005	197.1
2006	177.8
2007	185.2