Year	US Dollars
1960	0.00295
1961	0.51897
1962	0.01275
1963	0.02358
1964	-0.00543
1966	0.89081
1967	2.29405
1968	0.00249
1969	0.00365
1970	0.00951
1971	0.01392
1972	0.01467
1973	0.01206
1974	0.07337
1975	2.09507
1976	6.9736
1977	7.70005
1978	9.68986
1979	12.93153
1980	14.63694
1981	12.04895
1982	17.18308
1983	17.01919
1984	20.4664
1985	23.31928
1986	32.53576
1987	51.30896
1988	70.74293
1989	61.50858
1990	74.98125
1991	78.54039
1992	105.64469
1993	82.84802
1994	80.46336
1995	68.18862
1996	55.14643
1997	57.39171
1998	61.45116
1999	47.21854
2000	51.06732
2001	52.76796
2002	118.608
2003	54.70024
2004	63.17986
2005	63.81934
2006	79.18313
2007	83.87909
2008	91.23543
2009	89.74598
2010	84.21398
2011	86.92901
2012	84.60196
2013	91.5858
2014	80.87999
2015	67.76826
2016	55.37777
2017	63.21755
2018	61.97552
2019	60.80218
2020	81.9716
2021	70.26795