Year	US Dollars
1960	1.64608
1961	1.0708
1962	1.34161
1963	1.24785
1964	1.06119
1965	1.58661
1966	1.38942
1967	1.83347
1968	1.92473
1969	1.96191
1970	2.06724
1971	1.70343
1972	1.41802
1973	1.56381
1974	1.7759
1975	2.06583
1976	4.00624
1977	3.05832
1978	5.83883
1979	8.67693
1980	9.09489
1981	8.65896
1982	8.04124
1983	8.59739
1984	9.09025
1985	8.83349
1986	8.7672
1987	8.75014
1988	9.88992
1989	12.58449
1990	14.37648
1991	12.7232
1992	12.97248
1993	10.07164
1994	9.85804
1995	14.07459
1996	13.80875
1997	10.2456
1998	11.33432
1999	16.26997
2000	11.11
2001	4.46741
2002	4.637
2003	-14.48957
2004	0.79404
2005	-2.5004
2006	-3.22937
2007	-4.59741
2008	-9.14193
2009	-0.45758
2010	-0.29823
2011	-1.95189
2012	-1.89959
2013	0.41378
2014	5.06726
2015	0.83463
2016	3.22602
2017	3.52929
2018	-5.89488
2019	-4.93144
2020	2.76891
2021	1.83573