Quarter	US Dollars, monthly level
1991-01-01	1193800000.0000000
1991-04-01	1219400000.0000000
1991-07-01	1424700000.0000000
1991-10-01	1129100000.0000000
1992-01-01	1275300000.0000000
1992-04-01	1538000000.0000000
1992-07-01	1829500000.0000000
1992-10-01	2043100000.0000000
1993-01-01	2340300000.0000000
1993-04-01	2509200000.0000000
1993-07-01	2405500000.0000000
1993-10-01	2574300000.0000000
1994-01-01	2463900000.0000000
1994-04-01	2936700000.0000000
1994-07-01	3307100000.0000000
1994-10-01	3233100000.0000000
1995-01-01	3141800000.0000000
1995-04-01	3566300000.0000000
1995-07-01	3557800000.0000000
1995-10-01	3617500000.0000000
1996-01-01	3278400000.0000000
1996-04-01	3397400000.0000000
1996-07-01	3473200000.0000000
1996-10-01	3531600000.0000000
1997-01-01	3140300000.0000000
1997-04-01	3889300000.0000000
1997-07-01	4055500000.0000005
1997-10-01	4249100000.0000005
1998-01-01	3980500000.0000000
1998-04-01	3967200000.0000000
1998-07-01	3688600000.0000000
1998-10-01	3041100000.0000000
1999-01-01	2511600000.0000000
1999-04-01	2557900000.0000000
1999-07-01	2589300000.0000000
1999-10-01	3000600000.0000000
2000-01-01	2812200000.0000000
2000-04-01	3022300000.0000000
2000-07-01	2881600000.0000000
2000-10-01	3040900000.0000000
2001-01-01	3168300000.0000000
2001-04-01	3353400000.0000000
2001-07-01	3194800000.0000000
2001-10-01	3104200000.0000000
2002-01-01	2725600000.0000000
2002-04-01	3324300000.0000000
2002-07-01	3266800000.0000000
2002-10-01	3378700000.0000000
2003-01-01	3320400000.0000000
2003-04-01	3329700000.0000000
2003-07-01	3599700000.0000000
2003-10-01	3631900000.0000000
2004-01-01	3587200000.0000000
2004-04-01	4067199999.9999995
2004-07-01	4257200000.0000000
2004-10-01	4852700000.0000000
2005-01-01	4559800000.0000000
2005-04-01	5406400000.0000000
2005-07-01	5580100000.0000000
2005-10-01	5657900000.0000000
2006-01-01	5653200000.0000000
2006-04-01	6375500000.0000000
2006-07-01	6849400000.0000000
2006-10-01	7284400000.0000000
2007-01-01	7389800000.0000000
2007-04-01	7903400000.0000000
2007-07-01	8445300000.0000000
2007-10-01	9158600000.0000000
2008-01-01	8882000000.0000000
2008-04-01	10049700000.0000000
2008-07-01	10648300000.0000000
2008-10-01	10085900000.0000000
2009-01-01	7972800000.0000000
2009-04-01	7601200000.0000000
2009-07-01	8468900000.0000000
2009-10-01	8848100000.0000000
2010-01-01	8768100000.0000000
2010-04-01	9427700000.0000000
2010-07-01	10893000000.0000000
2010-10-01	11396900000.0000000
2011-01-01	12098100000.0000000
2011-04-01	13519400000.0000000
2011-07-01	14275400000.0000000
2011-10-01	14339600000.0000000
2012-01-01	14043600000.0000000
2012-04-01	15018200000.0000000
2012-07-01	15112200000.0000000
2012-10-01	14873600000.0000000
2013-01-01	14170700000.0000000
2013-04-01	14659500000.0000000
2013-07-01	15234400000.0000000
2013-10-01	15316500000.0000000
2014-01-01	14759500000.0000000
2014-04-01	15801700000.0000000
2014-07-01	16777400000.0000000
2014-10-01	16690200000.0000000
2015-01-01	14113300000.0000000
2015-04-01	13122000000.0000000
2015-07-01	13904500000.0000000
2015-10-01	12917800000.0000000
2016-01-01	10575700000.0000000
2016-04-01	10971800000.0000000
2016-07-01	11523500000.0000000
2016-10-01	11818500000.0000000
2017-01-01	11300200000.0000000
2017-04-01	11539600000.0000000
2017-07-01	11673900000.0000000
2017-10-01	11562100000.0000000
2018-01-01	11452600000.0000000
2018-04-01	12980000000.0000000