Year	US Dollars
1960	61912318.80246
1961	44445573.08751
1962	55789320.11612
1963	79267507.80764
1964	102820687.66243
1965	61617245.75401
1966	78964852.01792
1967	80487503.90751
1968	162785609.58004
1969	131943080.22062
1970	96959827.87458
1971	59922284.74723
1972	83324188.69997
1973	63260153.02671
1974	224756727.6418
1975	5599275.17196
1976	256120021.09223
1977	394416072.22738
1978	-72233798.89469
1979	-279708329.57255
1980	-628550923.51557
1981	-599488896.94423
1982	-219715897.4128
1983	84762239.08719
1984	925034517.60781
1985	1003198538.27268
1986	853046363.92276
1987	384312563.26185
1988	266427838.40896
1989	290588102.56661
1990	494261410.21535
1991	317468272.4882
1992	423133528.88151
1993	390620459.41095
1994	932626988.56836
1995	804798839.58358
1996	1054015071.76977
1997	893680566.43024
1998	810469601.07588
1999	1022900634.41704
2000	742073858.35736
2001	878589596.59008
2002	1859573806.27104
2003	1303409513.03707
2004	1358017493.59436
2005	1003582965.49118
2006	1720535538.92109
2007	1020097782.6964
2008	1685404348.7203
2009	2653446319.81063
2010	1818025064.76174
2011	4184180639.38054
2012	1120608484.83851
2013	917948977.52582
2014	3873340940.90987
2015	3169874830.8525
2016	3345826585.69501
2017	3949387264.54428