Year	US Dollars
1960	-114090909.09091
1961	-189909090.90909
1962	-78363636.36364
1963	-140062500
1964	-58478260.86957
1965	37593750
1966	66179487.17949
1967	80039215.68627
1968	43043478.26087
1969	168872093.02326
1970	35274336.28319
1971	-131106557.37705
1972	-426951923.07692
1973	-351220670.39106
1974	37118589.74359
1975	-187415539.71487
1976	375902321.83908
1977	-320300074.28041
1978	-613756958.30701
1979	-745710059.0604
1980	-1387218823.07692
1981	-3683471884.61539
1982	-668341889.60911
1983	412394244.19343
1984	-325709582.65638
1985	339590757.80181
1986	488642326.75063
1987	555238836.88072
1988	1690637664.58512
1989	1323075705.56284
1990	1074036738.9308
1991	1705493949.37289
1992	767389758.39815
1993	-910876619.73922
1994	975672206.19734
1995	1678523005.0155
1996	-1152558211.6089
1997	-1703901576.16083
1998	-2674841981.57684
1999	1642543690.39664
2000	1360680636.52709
2001	1174103067.69144
2002	1544071865.4745
2003	3783537905.26469
2004	9793134691.97578
2005	10701470286.6815
2006	22431203330.53609
2007	23837127670.7572
2008	3697969946.2735
2009	13350436306.6427
2010	14044335591.511
2011	8370349195.88354
2012	-75138734.39194
2013	-1599401056.06424
2014	2472309832.30946
2015	-535592865.94088
2016	2136333069.11199
2017	4743936841.14484