Year	US Dollars, Monthly Level
1960-01-01	-310864230.79260300
1961-01-01	-274544292.65618700
1962-01-01	-369667658.94167197
1963-01-01	-477728854.68100600
1964-01-01	-288563570.36725500
1965-01-01	-287199064.13625000
1966-01-01	-448736634.36780596
1967-01-01	-670010969.30723500
1968-01-01	-988904437.43124100
1969-01-01	-1201469586.03120000
1970-01-01	-1138671725.23822000
1971-01-01	-1336487200.45279000
1972-01-01	-907782738.50677500
1973-01-01	-1008596016.07530000
1974-01-01	-2382963469.02741000
1975-01-01	-2398191129.07652000
1976-01-01	-1089878486.60654000
1977-01-01	-821117435.78549300
1978-01-01	-2279745494.00070000
1979-01-01	-5265474882.55375000
1980-01-01	-4750681480.98312000
1981-01-01	-4783988625.92805000
1982-01-01	-2456173940.47531000
1983-01-01	-1933595537.29144000
1984-01-01	-1536384032.46244000
1985-01-01	-1035001421.08850990
1986-01-01	2698216268.87017000
1987-01-01	6009258109.65014000
1988-01-01	8703997717.70321000
1989-01-01	841790290.84551910
1990-01-01	-4926943149.92911000
1991-01-01	-9885347144.42444000
1992-01-01	-5013389916.46029000
1993-01-01	-1490689466.60486000
1994-01-01	-6612830544.32674000
1995-01-01	-10082702171.56400000
1996-01-01	-20257140501.78920000
1997-01-01	-8584973472.96843900
1998-01-01	39538921766.72640000
1999-01-01	24061912665.68740000
2000-01-01	11359847258.73080000
2001-01-01	9181484085.91115000
2002-01-01	9992201749.10627000
2003-01-01	14594725528.52780000
2004-01-01	29004336051.99460000
2005-01-01	22860940844.84000000
2006-01-01	15224575688.72700100
2007-01-01	14051332119.27380000
2008-01-01	-14101287561.27920000
2009-01-01	39190767020.33960000
2010-01-01	40016362114.12570000
2011-01-01	30477502596.74240000
2012-01-01	29804561390.77260200
2013-01-01	43996587288.83120000
2014-01-01	46786265820.67020400
2015-01-01	90056010406.02519000
2016-01-01	89695437058.37740000
2017-01-01	94538892880.98639000