Year	US Dollars
1960	0.00504
1961	0.00491
1963	0.0047
1965	37.15274
1966	37.68011
1967	42.30518
1968	46.40147
1969	48.90737
1970	59.32363
1971	56.70543
1972	74.29425
1973	72.96762
1974	96.16169
1975	108.95837
1976	82.76383
1977	86.15726
1978	97.68741
1979	92.54408
1980	102.47399
1981	100.80235
1982	94.61361
1983	98.03016
1984	93.54075
1985	73.30072
1986	72.78346
1987	86.7223
1988	98.96863
1989	86.62866
1990	95.78336
1991	86.28675
1992	104.73224
1993	65.91733
1994	67.10928
1995	77.61827
1996	79.23701
1997	68.28025
1998	69.82135
1999	39.91628
2000	49.92106
2001	36.14116
2002	34.55184
2003	36.58525
2004	41.6563
2005	41.29828
2006	40.79922
2007	47.48691
2008	42.92807
2009	55.09119
2010	67.81772
2011	78.9687
2012	83.50667
2013	79.73196
2014	68.74994
2015	68.11543
2016	59.73367
2017	58.43576
2018	84.71763
2019	68.03259
2020	108.21426
2021	118.77556