Year	US Dollars
1961	3.44686
1967	0.60921
1974	0.01688
1975	0.41658
1976	0.73813
1978	0.01593
1979	0.72492
1980	0.77854
1981	0.38506
1982	0.35109
1983	0.67934
1986	0.43212
1988	0.02767
1990	0.13191
1991	1.21658
1992	0.16588
1993	0.52818
1994	0.28497
1995	0.02441
1996	0.09624
1997	0.50988
1998	1.95228
1999	176.33437
2000	263.29751
2001	217.43536
2002	240.80982
2003	188.87022
2004	170.44596
2005	190.46479
2006	210.2831
2007	274.64237
2008	260.14404
2009	199.33554
2010	266.37918
2011	247.73221
2012	249.31528
2013	222.60677
2014	210.61249
2015	176.05549
2016	182.67756
2017	186.57776
2018	164.56062
2019	179.54793
2020	192.06227
2021	191.33316