Year	US Dollars
1960	0.03896
1961	1.07831
1962	5.02136
1963	7.6231
1964	27.52718
1965	23.7793
1966	24.2556
1967	26.5752
1968	23.16901
1969	32.00326
1970	39.7862
1971	38.90482
1972	43.09895
1973	61.68855
1974	37.93985
1975	91.05436
1976	50.03978
1977	39.09741
1978	60.98563
1979	50.15147
1980	74.19788
1981	56.14485
1982	78.33229
1983	78.23962
1984	90.32693
1985	70.92969
1986	89.34048
1987	90.89342
1988	113.64222
1989	138.06456
1990	133.49568
1991	141.29774
1992	66.03717
1993	94.66956
1994	165.53418
1995	128.11463
1996	109.95124
1997	32.91219
1998	36.89768
1999	38.52465
2000	9.3092
2001	6.61263
2002	53.41002
2003	-7.92224
2004	28.25469
2005	34.49096
2006	20.77158
2007	34.33404
2008	40.07555
2009	47.14123
2010	62.10606
2011	39.18194
2012	37.48561
2013	45.84629
2014	56.57255
2015	48.69567
2016	19.95009
2017	49.69127
2018	53.37106
2019	51.64561
2020	23.20973
2021	41.45774