Year	US Dollars, Monthly Level
1980-01-01	-8058857843.150220
1981-01-01	-4807707494.812770
1982-01-01	-4030596023.772230
1983-01-01	-2517920270.393480
1984-01-01	-1797106149.939280
1985-01-01	-1242812517.982680
1986-01-01	952128919.159991
1987-01-01	-379235322.473560
1988-01-01	-2117909734.806860
1989-01-01	-3569562878.797750
1990-01-01	-4644149584.975910
1991-01-01	-7358566783.769230
1992-01-01	-5735992311.147710
1993-01-01	1515282238.390380
1994-01-01	4153195835.643040
1995-01-01	6831614119.242420
1996-01-01	7372251956.722420
1997-01-01	6827720945.667500
1998-01-01	3349169185.695980
1999-01-01	2189085304.553640
2000-01-01	-3035451850.496560
2001-01-01	3525171503.162360
2002-01-01	8623150321.666980
2003-01-01	6563026264.892520
2004-01-01	4075197427.013050
2005-01-01	-525793502.054433
2006-01-01	-3998804910.558620
2007-01-01	-9100441698.231040
2008-01-01	-13458659865.008400
2009-01-01	456668398.484075
2010-01-01	-6676024030.670250
2011-01-01	-8274836681.533160
2012-01-01	4049205649.764760
2013-01-01	12237600867.731200