Year	US Dollars, Monthly Level
1990-01-01	21877268000.00000
1991-01-01	25868842000.00000
1992-01-01	27279629000.00000
1993-01-01	28327840000.00000
1994-01-01	31982704000.00000
1995-01-01	40628729000.00000
1996-01-01	42928504043.00000
1997-01-01	41679782972.00000
1998-01-01	27336871667.00000
1999-01-01	24003178331.00000
2000-01-01	33514805420.00000
2001-01-01	30962641071.00000
2002-01-01	31289453094.00000
2003-01-01	32550684286.00000
2004-01-01	46524531358.00000
2005-01-01	57700882616.00000
2006-01-01	61065465536.00000
2007-01-01	74473430118.00000
2008-01-01	129197306223.99998
2009-01-01	96827865738.00000
2010-01-01	135663284048.00002
2011-01-01	176440000000.00000
2012-01-01	191696083170.00000
2013-01-01	186628669880.00000
2014-01-01	178178816605.00000
2015-01-01	142694804223.00000
2016-01-01	135652816500.99998
2017-01-01	156985563722.00000