Year	US Dollars
1961	1.38911
1966	4.92658
1967	0.88946
1969	0.11907
1971	0.18503
1973	0.01658
1974	16.13276
1975	31.47195
1976	35.44855
1977	52.30462
1978	62.45531
1979	63.93638
1980	69.87691
1981	75.88552
1982	73.64057
1983	72.24946
1984	61.37371
1985	62.73831
1986	75.75575
1987	119.6349
1988	106.90503
1989	119.90746
1990	129.78262
1991	113.51745
1992	104.89743
1993	89.45258
1994	160.01953
1995	105.26108
1996	158.48621
1997	107.12783
1998	81.08467
1999	43.59812
2000	65.86511
2001	48.26703
2002	46.57465
2003	110.49266
2004	57.79471
2005	48.38688
2006	62.37222
2007	86.56585
2008	91.16311
2009	97.82634
2010	82.31135
2011	74.97745
2012	48.59876
2013	62.21753
2014	63.2418
2015	53.155
2016	107.28505
2017	60.30345
2018	79.80446
2019	57.27098
2020	73.10643
2021	80.61256