Year	US Dollars
1960	-0.00933
1961	4.32798
1963	0.00536
1965	0.1935
1966	0.49421
1967	3.11969
1968	0.0017
1969	-0.01855
1970	-0.00498
1971	0
1972	0.01414
1973	0.02432
1974	0.05439
1975	0.67684
1976	2.40547
1977	6.3233
1978	6.03094
1979	5.85089
1980	6.29528
1981	6.97681
1982	6.6021
1983	7.96403
1984	9.7123
1985	9.07566
1986	12.60577
1987	12.57053
1988	14.19768
1989	14.60379
1990	22.46835
1991	22.65819
1992	27.19888
1993	22.19543
1994	33.2097
1995	29.93189
1996	31.93345
1997	23.84887
1998	21.81772
1999	24.4185
2000	18.43411
2001	16.68852
2002	23.63706
2003	27.22857
2004	60.97503
2005	21.31926
2006	8.11017
2007	12.43347
2008	17.0131
2009	10.61593
2010	10.06541
2011	7.9533
2012	9.67156
2013	10.92056
2014	8.6769
2015	13.51194
2016	7.08392
2017	7.38928
2018	5.20312
2019	0.65031
2020	3.32262
2021	6.71608