Quarter	US Dollars, sum over component sub-periods
1991-01-01	22071606075.651700
1991-04-01	20913903927.939700
1991-07-01	24776588280.607900
1991-10-01	22614522297.117300
1992-01-01	23121637792.552600
1992-04-01	24752280802.824800
1992-07-01	32212099419.597100
1992-10-01	26210536864.634598
1993-01-01	23104602693.389900
1993-04-01	25656292923.799500
1993-07-01	29311217853.239800
1993-10-01	24354017941.403700
1994-01-01	23571596914.511100
1994-04-01	26386227169.879400
1994-07-01	33897325081.085697
1994-10-01	28005772538.222300
1995-01-01	30006898716.013798
1995-04-01	32563546898.725100
1995-07-01	38292718902.439000
1995-10-01	32312060697.647200
1996-01-01	30355653632.958800
1996-04-01	31822236980.090700
1996-07-01	38633039574.060905
1996-10-01	32831874786.017600
1997-01-01	29832255921.198097
1997-04-01	31844031498.453100
1997-07-01	35395742130.295300
1997-10-01	31566949273.437800
1998-01-01	28981082031.009500
1998-04-01	32064889646.348300
1998-07-01	38744314509.670494
1998-10-01	35014644935.416600
1999-01-01	31305527652.185100
1999-04-01	33454598086.436703
1999-07-01	39239053265.387900
1999-10-01	36260571118.805600
2000-01-01	31886664894.400200
2000-04-01	33139723322.696800
2000-07-01	37546239850.558205
2000-10-01	34202164062.522896
2001-01-01	33501406176.451600
2001-04-01	33541997588.153797
2001-07-01	39626098114.651200
2001-10-01	35103848666.465800
2002-01-01	31251835842.629800
2002-04-01	34331970010.766804
2002-07-01	42172683940.828700
2002-10-01	37408461143.520000
2003-01-01	37388679408.209694
2003-04-01	41510020542.324000
2003-07-01	49706762784.168200
2003-10-01	44062080885.615300
2004-01-01	44301559604.730700
2004-04-01	46974471232.493100
2004-07-01	54352895224.268196
2004-10-01	50080252977.454600
2005-01-01	48501393154.701200
2005-04-01	50884114891.564500
2005-07-01	59187256426.945595
2005-10-01	51166241009.738100
2006-01-01	49061383464.995900
2006-04-01	53386192302.369800
2006-07-01	63934997448.433300
2006-10-01	58712560499.759200
2007-01-01	55572933431.225500
2007-04-01	61072009293.354800
2007-07-01	74599370888.684900
2007-10-01	68233860544.509605
2008-01-01	66727163232.604000
2008-04-01	75706707489.889400
2008-07-01	83506187205.568100
2008-10-01	62205207612.604900
2009-01-01	52990839360.588500
2009-04-01	59790833438.548706
2009-07-01	72273589741.656800
2009-10-01	65174851315.210396
2010-01-01	58817075702.015396
2010-04-01	62752851480.954796
2010-07-01	72676248286.665400
2010-10-01	68759137323.628800
2011-01-01	64925436909.455200
2011-04-01	74267734197.327000
2011-07-01	84527235609.951000
2011-10-01	72750304023.610290
2012-01-01	68214348500.345800
2012-04-01	70966702184.336700
2012-07-01	81182446276.329100
2012-10-01	74040992158.991400
2013-01-01	74435334811.306990
2013-04-01	78519924695.584610
2013-07-01	90299739118.867700
2013-10-01	84797383190.562800
2014-01-01	75881423967.306400
2014-04-01	81735189154.914400
2014-07-01	91956326867.646000
2014-10-01	82491594190.183900
2015-01-01	66055559256.817900
2015-04-01	69906641191.817600
2015-07-01	80320139006.886100
2015-10-01	79128011647.222300
2016-01-01	68770955567.647700
2016-04-01	75749033498.658310
2016-07-01	83748435756.185610
2016-10-01	79527721652.971800
2017-01-01	70489798777.501890
2017-04-01	79413793789.241200
2017-07-01	93508243542.013990
2017-10-01	89204020303.223300
2018-01-01	80148627097.278000
2018-04-01	86095705317.553910