Year	US Dollars, Monthly Level
1971-01-01	-374532826.319050000
1972-01-01	-284494593.281613000
1973-01-01	-29858058.342153702
1974-01-01	-4684393151.346120000
1975-01-01	-3512606162.474010000
1976-01-01	-2358488799.859349700
1977-01-01	147788102.843021000
1978-01-01	-1020063488.703760000
1979-01-01	-2718540474.531650000
1980-01-01	-2929287699.286540000
1981-01-01	1259404477.684450000
1982-01-01	886753498.393073100
1983-01-01	6451098654.623890000
1984-01-01	12908421009.395600000
1985-01-01	12473580313.846200000
1986-01-01	8587854464.380060000
1987-01-01	10859647835.369800000
1988-01-01	18976800824.407400000
1989-01-01	16332427245.783901000
1990-01-01	10906182718.801000000
1991-01-01	10953461200.204601000
1992-01-01	15174103965.141000000
1993-01-01	13651704401.186000000
1994-01-01	10741394348.702600000
1995-01-01	-3631325273.845070000
1996-01-01	-5503493733.860290000
1997-01-01	-6492407248.456820000
1998-01-01	-6271478596.561171000
1999-01-01	-1133736302.396110000
2000-01-01	-1181093653.625510200
2001-01-01	2814258082.222170000
2002-01-01	12996375762.231700000
2003-01-01	24689700984.140100000
2004-01-01	32945866942.648700000
2005-01-01	45332758754.827600000
2006-01-01	46724646449.367600000
2007-01-01	40668015962.787400000
2008-01-01	23468379471.814503000
2009-01-01	25273753369.815900000
2010-01-01	19387965813.352800000
2011-01-01	28960968000.336500000
2012-01-01	18983402782.076600000
2013-01-01	2684004713.949830000
2014-01-01	-4009618413.007509700
2015-01-01	19133390520.353500000
2016-01-01	47820317520.961800000
2017-01-01	67177458261.305700000