Year	US Dollars
1960	1.81592
1961	0.64753
1962	1.01073
1963	0.70739
1964	2.29285
1965	2.8166
1966	1.35055
1967	2.49763
1968	1.83458
1969	2.2096
1970	1.22798
1971	1.85624
1972	4.13473
1973	5.4796
1974	3.69935
1975	4.15856
1976	4.20662
1977	4.01017
1978	5.39346
1979	5.65103
1980	6.02092
1981	7.48863
1982	6.36925
1983	7.95447
1984	7.02832
1985	8.30082
1986	15.84588
1987	12.11352
1988	13.24394
1989	12.85854
1990	18.56905
1991	15.06541
1992	25.35421
1993	21.03541
1994	14.91228
1995	12.3836
1996	12.1349
1997	8.67506
1998	7.95684
1999	8.68929
2000	7.09098
2001	6.94722
2002	6.80539
2003	8.73819
2004	5.49608
2005	6.81372
2006	6.76903
2007	7.10451
2008	0.73291
2009	3.65467
2010	6.15459
2011	-1.41035
2012	-0.03438
2013	1.92638
2014	6.6858
2015	4.99799
2016	2.70464
2017	1.50349
2018	5.04196
2019	8.0292
2020	12.98001
2021	14.33478