Year	US Dollars
1960	0.00796
1961	0.58012
1962	1.44603
1963	1.61481
1964	6.72843
1965	6.53546
1966	5.35027
1967	5.72134
1968	4.52913
1969	4.43744
1970	4.87524
1971	9.38356
1972	6.34899
1973	8.2048
1974	10.01734
1975	16.01502
1976	14.66624
1977	13.76586
1978	16.59093
1979	22.6691
1980	23.01289
1981	20.61108
1982	19.65773
1983	20.35946
1984	17.477
1985	21.24876
1986	29.58881
1987	28.51484
1988	32.69501
1989	53.79261
1990	51.98874
1991	50.19038
1992	49.29479
1993	50.42953
1994	43.28262
1995	46.40031
1996	46.46946
1997	34.62488
1998	31.17015
1999	31.29369
2000	34.97702
2001	38.8822
2002	29.8098
2003	39.42836
2004	49.62788
2005	42.83495
2006	47.64103
2007	54.96105
2008	71.48961
2009	73.86852
2010	72.97175
2011	69.15317
2012	50.7166
2013	64.04281
2014	56.46056
2015	39.93768
2016	44.47213
2017	58.63697
2018	48.1279
2019	48.26188
2020	82.98425
2021	64.90704