Year	US Dollars, Monthly Level
1960-01-01	-89455499.38362001
1961-01-01	141483715.29595200
1962-01-01	89075228.81663780
1963-01-01	392012543.92102700
1964-01-01	761004968.83916900
1965-01-01	126352095.34005400
1966-01-01	265130950.16269898
1967-01-01	502297090.46649796
1968-01-01	1222718744.01560000
1969-01-01	683926991.48394800
1970-01-01	2745237375.36349000
1971-01-01	2202217867.64747000
1972-01-01	1422753585.22061000
1973-01-01	2069966723.25180030
1974-01-01	726628289.61808900
1975-01-01	-1391148585.79038000
1976-01-01	1011758592.19856990
1977-01-01	2093427179.75600980
1978-01-01	2588561014.21599960
1979-01-01	2384545110.26876970
1980-01-01	5932070271.16335000
1981-01-01	3558193563.15873960
1982-01-01	13538787254.01859900
1983-01-01	12096947584.74860000
1984-01-01	12951492527.94760000
1985-01-01	10958379842.83120000
1986-01-01	5871539385.78196050
1987-01-01	6671519830.89693000
1988-01-01	5870341772.96058000
1989-01-01	2964710291.97116000
1990-01-01	10929303665.55570000
1991-01-01	9201078451.98119000
1992-01-01	12250699814.60229900
1993-01-01	13613663637.31339800
1994-01-01	16795418490.11170000
1995-01-01	26750059572.25510000
1996-01-01	31715916062.52610000
1997-01-01	18139194037.34580000
1998-01-01	13501171848.51550100
1999-01-01	23568844889.31990000
2000-01-01	37858104135.50020000
2001-01-01	39379389757.01099400
2002-01-01	30206301372.70140000
2003-01-01	32156852089.18070200
2004-01-01	43351131754.42080000
2005-01-01	45797042669.46419500
2006-01-01	38191409757.32270000
2007-01-01	40043684680.31610000
2008-01-01	46357362547.33370000
2009-01-01	-4911616631.82893000
2010-01-01	-4702239873.75861900
2011-01-01	41450737.17283570
2012-01-01	-6906257534.24273000
2013-01-01	-3605287467.75317000
2014-01-01	13191708106.82350000
2015-01-01	-9454704144.24297000
2016-01-01	-12131197369.35349800
2017-01-01	-11531850178.45209900