Year	US Dollars, Monthly Level
1970-01-01	5190000000
1971-01-01	6640000000
1972-01-01	2580000000
1973-01-01	850000000
1974-01-01	-27840000000
1975-01-01	2680000000
1976-01-01	-20520000000
1977-01-01	-25220000000
1978-01-01	-9840000000
1979-01-01	-55950000000
1980-01-01	-78740000000
1981-01-01	-42100000000
1982-01-01	-31130000000
1983-01-01	-42980000000
1984-01-01	-83170000000
1985-01-01	-90010000000
1986-01-01	-34690000000
1987-01-01	-55910000000
1988-01-01	-43650000000
1989-01-01	-40120000000
1990-01-01	-38120000000
1991-01-01	-13820000000
1992-01-01	17690000000
1993-01-01	52560000000
1994-01-01	35860000000
1995-01-01	48740000000
1996-01-01	16550000000
1997-01-01	8840000000
1998-01-01	-39200000000
1999-01-01	-153810000000
2000-01-01	-303210000000
2001-01-01	-279260000000
2002-01-01	-281550000000
2003-01-01	-343730000000
2004-01-01	-440200000000
2005-01-01	-615180000000
2006-01-01	-699840000000
2007-01-01	-669500000000
2008-01-01	-782720000000
2009-01-01	-501300000000
2010-01-01	-642340000000
2011-01-01	-863460000000
2012-01-01	-832520000000
2013-01-01	-780190000000
2014-01-01	-792440000000
2015-01-01	-705890000000
2016-01-01	-628830000000