Year	US Dollars
1960	4.9245
1961	4.44334
1962	3.82805
1963	4.01611
1964	2.10401
1965	1.5768
1966	1.85419
1967	2.16916
1968	1.56109
1969	1.90128
1970	2.80688
1971	6.00927
1972	9.9242
1973	21.25983
1974	44.50193
1975	12.07505
1976	0.11416
1977	0.04967
1978	0.04529
1979	17.84425
1980	43.34115
1981	17.66839
1982	5.4217
1983	5.67135
1984	3.05723
1985	1.87633
1986	1.99835
1987	2.08386
1988	2.45109
1989	2.88417
1990	4.63594
1991	9.68857
1992	20.01602
1993	28.75273
1994	27.92216
1995	46.30053
1996	34.38106
1997	28.4038
1998	26.42368
1999	21.11857
2000	28.51428
2001	29.74504
2002	32.42296
2003	34.65515
2004	31.26985
2005	34.18995
2006	35.34336
2007	46.38569
2008	43.93036
2009	45.06511
2010	47.41452
2011	47.47876
2012	54.62296
2013	53.88181
2014	52.77034
2015	44.04339
2016	46.62204
2017	54.08861
2018	48.88539
2019	59.62828
2020	83.75018
2021	81.91079