Year	US Dollars
1960	0.04771
1961	1.17215
1962	2.52839
1963	1.7777
1964	12.8808
1965	9.63111
1966	21.81569
1967	12.18546
1968	19.8695
1969	10.85567
1970	6.69222
1971	12.63446
1972	11.20553
1973	25.15973
1974	77.49424
1975	63.86494
1976	153.68917
1977	128.79626
1978	168.86507
1979	116.27494
1980	116.3939
1981	143.79833
1982	117.42241
1983	109.06597
1984	101.88273
1985	118.85939
1986	128.24741
1987	104.75438
1988	95.98357
1989	128.30428
1990	117.7352
1991	105.21211
1992	92.95343
1993	151.01937
1994	116.1632
1995	96.72143
1996	112.09988
1997	96.23319
1998	65.03036
1999	84.98018
2000	82.9795
2001	102.37441
2002	128.80873
2003	90.46844
2004	66.10047
2005	62.67511
2006	70.20575
2007	110.62284
2008	140.65659
2009	113.15783
2010	109.25991
2011	108.31244
2012	112.70002
2013	78.74518
2014	67.83716
2015	83.48749
2016	75.83868
2017	70.12715
2018	105.00123
2019	90.4616
2020	143.35559
2021	92.05252