Year	US Dollars
1960	-4719999.79019
1961	-28979999.54224
1962	626590026.85547
1963	307549987.79297
1964	-383470001.2207
1965	17770000.45776
1966	179270004.27246
1967	156699996.94824
1968	107980003.35693
1969	67419998.16895
1970	31659999.84741
1971	47349998.47412
1972	45790000.91553
1973	39130001.06812
1974	21600000.38147
1975	13600000.38147
1976	-55240001.67847
1977	-29610000.61035
1978	-52860000.61035
1979	24020000.45776
1980	41500000
1981	43669998.16895
1982	49139999.38965
1983	48500000
1984	50349998.47412
1985	47310001.37329
1986	44290000.91553
1987	40270000.45776
1988	45259998.32153
1989	114830001.83106
1990	118199996.94824
1991	44520000.45776
1992	44729999.54224
1993	56000000
1994	35009998.32153
1995	53560001.37329
1996	44240001.67847
1997	4980000.01907
1998	56060001.37329
1999	62889999.38965
2000	126099998.47412
2001	70489997.86377
2002	86290000.91553
2003	106099998.47412
2004	54919998.16895
2005	56590000.15259
2006	63840000.15259
2007	73809997.55859
2008	57369998.93188
2009	58509998.32153
2010	53180000.30518
2011	46810001.37329
2012	50439998.62671
2013	37130001.06812
2014	41470001.2207
2015	39590000.15259
2016	46930000.30518
2017	91449996.94824
2018	148449996.94824
2019	266959991.45508
2020	331700012.20703
2021	257359985.35156