Year	US Dollars
1960	-111447030.30571
1961	-115817517.30246
1962	-156655090.94091
1963	-182185198.82058
1964	-217148883.09745
1965	-272054647.56714
1966	-196909368.45414
1967	-121186845.23058
1968	-223325723.37905
1969	-349494730.5123
1970	-362337176.33718
1971	-385203142.96665
1972	-363749016.52242
1973	-538409029.51958
1974	-1142006628.61351
1975	-626191114.98258
1976	-795847296.9148
1977	-1076039016.3484
1978	-1510368015.70523
1979	-2981856382.97872
1980	-2953074607.54167
1981	-2940173532.76714
1982	-1695759333.78046
1983	-794914945.67877
1984	-338798446.30357
1985	66865495.12784
1986	308050021.19542
1987	1402766502.80899
1988	2253691781.64367
1989	2115406853.44346
1990	2161083365.89814
1991	2351703004.18304
1992	4062762829.96114
1993	5310560995.46459
1994	5384988221.43699
1995	7561729797.9798
1996	8295992943.54839
1997	9926301337.15377
1998	9809801502.74756
1999	12900511399.9574
2000	13819578035.7472
2001	17048322147.651
2002	21986664784.49089
2003	24892799097.0655
2004	27870511547.0574
2005	23045379927.8697
2006	18672625768.4105
2007	22325335340.8158
2008	23664083784.97139
2009	31844845790.4974
2010	36914186270.0318
2011	44707215021.5694
2012	38733441910.96441
2013	44970028669.01019
2014	45908543083.5676
2015	96189594613.60658
2016	67080590261.4549
2017	107241747313.73503