Year	US Dollars
1960	1.63611
1961	1.35113
1962	1.45018
1963	2.04514
1964	2.48643
1965	2.56781
1966	2.44563
1967	2.64781
1968	1.73295
1969	1.66007
1970	1.47921
1971	1.7586
1972	1.05329
1973	1.30632
1974	2.01797
1975	2.57438
1976	2.73685
1977	1.51731
1978	1.69774
1979	2.00102
1980	3.13701
1981	2.76694
1982	2.24331
1983	2.45434
1984	2.18371
1985	2.034
1986	2.49404
1987	2.07852
1988	2.33607
1989	2.07287
1990	1.60262
1991	3.07503
1992	2.67211
1993	1.58287
1994	2.4568
1995	1.79702
1996	1.93653
1997	1.64241
1998	1.57519
1999	1.43273
2000	1.30556
2001	1.60302
2002	1.58262
2003	0.64515
2004	0.68497
2005	1.62472
2006	1.18015
2007	1.11727
2008	1.66696
2009	2.00762
2010	2.28221
2011	2.60032
2012	1.31963
2013	1.90247
2014	2.28864
2015	2.3996
2016	2.00132
2017	2.36165
2018	1.79838
2019	1.8439
2020	1.28489
2021	2.21567