Year	US Dollars
1960	0.01496
1961	0.45016
1962	1.73981
1963	1.27638
1964	3.05274
1965	3.77376
1966	4.29686
1967	2.92095
1968	4.66875
1969	3.83057
1970	3.58978
1971	4.77602
1972	5.957
1973	10.93837
1974	17.64122
1975	21.52889
1976	12.78562
1977	15.88964
1978	22.20859
1979	25.9806
1980	36.1366
1981	30.2687
1982	27.13494
1983	27.76851
1984	39.79652
1985	46.24647
1986	45.43596
1987	42.49894
1988	50.52293
1989	50.96578
1990	53.56832
1991	49.28557
1992	46.15076
1993	38.91649
1994	45.32117
1995	54.4708
1996	48.37886
1997	41.44391
1998	32.65579
1999	32.46224
2000	25.62839
2001	30.36476
2002	35.17878
2003	45.06746
2004	45.8987
2005	54.97418
2006	63.80133
2007	72.51022
2008	66.50692
2009	65.50149
2010	70.28445
2011	79.02999
2012	60.28452
2013	82.18992
2014	70.41095
2015	66.34164
2016	64.4467
2017	70.42903
2018	78.10358
2019	88.28767
2020	73.76777
2021	64.70263