Year	US Dollars, Monthly Level
1991-01-01	-10915711048.324500
1992-01-01	-9019279837.517240
1993-01-01	10960121463.357900
1994-01-01	17023399999.999998
1995-01-01	20151100000.000000
1996-01-01	19770700000.000000
1997-01-01	14156000000.000000
1998-01-01	16204000000.000000
1999-01-01	32393000000.000000
2000-01-01	57089000000.000000
2001-01-01	45236000000.000000
2002-01-01	43647000000.000000
2003-01-01	55846000000.000000
2004-01-01	83616000000.000000
2005-01-01	116185000000.000000
2006-01-01	134294999999.999980
2007-01-01	123447000000.000000
2008-01-01	177627000000.000000
2009-01-01	113232000000.000000
2010-01-01	146995000000.000000
2011-01-01	196853000000.000000
2012-01-01	191663000000.000000
2013-01-01	180567000000.000000
2014-01-01	188930000000.000000
2015-01-01	148400000000.000000
2016-01-01	90217000000.000000
2017-01-01	115422000000.000000