Year	US Dollars
1966	-3274682.19746
1967	-3113823.35313
1968	-4528872.46196
1969	-4832525.32041
1970	-1630250.084
1971	-2682809.30595
1972	-4131064.80787
1973	-5472509.3985
1974	-4543164.41639
1975	1260066.37168
1976	-5943837.8937
1977	-14888791.97558
1978	-45032842.6907
1979	-58604374.07329
1980	-50294886.69378
1981	-49869410.10954
1982	-33064031.44791
1983	-25600697.3395
1984	-24232024.77609
1985	-22689334.60027
1986	-17588433.213
1987	-21773224.58442
1988	-21567363.30571
1989	-29029748.40445
1990	-37035156.74578
1991	-36069665.98344
1992	-44695751.88012
1993	-62259984.20082
1994	-55515414.64026
1995	-92162075.79393
1996	-62405238.23133
1997	-19713809.53315
1998	-27391727.97399
1999	-29481382.34855
2000	-37286120.92965
2001	-22599711.867
2002	-30809466.909
2003	-32491431.97631
2004	-84115604.01064
2005	-104950411.89275
2006	-87544582.88943
2007	-105293204.78905
2008	-158342495.62913
2009	-149149539.86579
2010	-180208482.07911
2011	-131222103.42311
2012	-122174386.08852
2013	-105540970.47634
2014	-160736108.11588
2015	-233471778.48533
2016	-182501238.90671
2017	-194453569.21227