Year	US Dollars, Monthly Level
1991-01-01	-1237470835.37102000
1992-01-01	-243050558.03482002
1993-01-01	-3455436245.64813000
1994-01-01	-3869809214.41475960
1995-01-01	-2437000620.73595000
1996-01-01	-2255523077.73473000
1997-01-01	-1982490271.08306000
1998-01-01	-2508760553.13662000
1999-01-01	-2733151048.19389960
2000-01-01	-3677515004.60755000
2001-01-01	-2835501371.37633000
2002-01-01	-2964875313.85456000
2003-01-01	-4345474943.49120000
2004-01-01	-4153360995.44405000
2005-01-01	-2983714185.11057000
2006-01-01	-1707935362.55777000
2007-01-01	799629448.29813900
2008-01-01	440645737.04485200
2009-01-01	6103273563.23627000
2010-01-01	7311821792.15438100
2011-01-01	9887635865.70079000
2012-01-01	8523954230.40237000
2013-01-01	8723075317.08496000
2014-01-01	8361416205.17540100
2015-01-01	9511596334.04117000
2016-01-01	10770406978.64990000
2017-01-01	9837479576.69753000