Quarter	US Dollars, sum over component sub-periods
1981-01-01	15859471742.928100
1981-04-01	18382099043.303700
1981-07-01	15921509052.152600
1981-10-01	16252812808.603800
1982-01-01	14446989798.963900
1982-04-01	14638596012.258800
1982-07-01	13222955039.559300
1982-10-01	12812353066.643600
1983-01-01	13731148645.021300
1983-04-01	15408268702.685300
1983-07-01	15123633670.296600
1983-10-01	16886255582.813702
1984-01-01	18114760771.940700
1984-04-01	19391989935.754100
1984-07-01	18136246591.558100
1984-10-01	17953410620.985600
1985-01-01	18103569564.550300
1985-04-01	20517356276.629100
1985-07-01	19355814780.672802
1985-10-01	19968216837.743100
1986-01-01	19940138600.427100
1986-04-01	21811160887.118702
1986-07-01	20291521690.081200
1986-10-01	20793212294.580800
1987-01-01	21268838844.253403
1987-04-01	22706962070.284200
1987-07-01	21566160919.618800
1987-10-01	24360490788.494200
1988-01-01	26627327676.033200
1988-04-01	28034041030.339300
1988-07-01	25817484348.991200
1988-10-01	27311136039.616000
1989-01-01	28958807296.666100
1989-04-01	31334405057.870100
1989-07-01	27588461236.422900
1989-10-01	29528526740.894203
1990-01-01	30551722627.392000
1990-04-01	31583053857.769200
1990-07-01	28386935494.714200
1990-10-01	30086334235.192400
1991-01-01	29256112981.136000
1991-04-01	31394292624.639000
1991-07-01	30227122133.098500
1991-10-01	31660144297.165900
1992-01-01	31444516128.771500
1992-04-01	33008108120.094600
1992-07-01	31434371953.692600
1992-10-01	31653828724.588700
1993-01-01	33003503009.862305
1993-04-01	35742386948.459404
1993-07-01	33181046073.777300
1993-10-01	34989192182.753400
1994-01-01	35142742481.247300
1994-04-01	38669337301.170600
1994-07-01	37427313033.830500
1994-10-01	40659234994.351000
1995-01-01	41721118427.660400
1995-04-01	43977929540.840700
1995-07-01	40073396778.530000
1995-10-01	41510607767.719900
1996-01-01	42862023407.294900
1996-04-01	43719071499.663500
1996-07-01	42237167757.845795
1996-10-01	45279378320.334900
1997-01-01	47559172237.535194
1997-04-01	51549643852.508510
1997-07-01	49126333625.730095
1997-10-01	52020772953.997894
1998-01-01	51274923717.965800
1998-04-01	53287686381.784000
1998-07-01	47925700846.215000
1998-10-01	51914548086.645900
1999-01-01	52107392686.888700
1999-04-01	55844639969.402800
1999-07-01	53230606981.060490
1999-10-01	58806542379.352400
2000-01-01	60588845210.011300
2000-04-01	63222635364.074700
2000-07-01	58981985241.231100
2000-10-01	60907269169.431700
2001-01-01	58335892792.515100
2001-04-01	60399388893.980400
2001-07-01	53510415021.873505
2001-10-01	53619832252.686295
2002-01-01	52663673744.523200
2002-04-01	59693092017.902000
2002-07-01	56378532954.713196
2002-10-01	58273961160.612900
2003-01-01	58883603708.691696
2003-04-01	63802366353.329094
2003-07-01	58388573671.998200
2003-10-01	63676266956.990400
2004-01-01	64275590283.417100
2004-04-01	70394360682.499700
2004-07-01	69811660622.194500
2004-10-01	74782114304.421000
2005-01-01	75300341009.439100
2005-04-01	81436441801.588700
2005-07-01	79283150958.279900
2005-10-01	83872842051.801000
2006-01-01	84210252632.669100
2006-04-01	93300229309.449200
2006-07-01	89350885694.252300
2006-10-01	89880825870.105600
2007-01-01	89110661016.629990
2007-04-01	97453977936.444200
2007-07-01	97702564817.451400
2007-10-01	104095706497.345000
2008-01-01	101703709568.028000
2008-04-01	113135061538.637010
2008-07-01	109281328186.803010
2008-10-01	93323151085.037200
2009-01-01	74497040124.380600
2009-04-01	78271507120.354400
2009-07-01	85349492759.248400
2009-10-01	91125090948.222700
2010-01-01	92364373341.863310
2010-04-01	101213329327.834000
2010-07-01	102804508866.075000
2010-10-01	105292891393.731000
2011-01-01	108406948805.655990
2011-04-01	118736914376.704000
2011-07-01	117822736926.334990
2011-10-01	116140248057.597000
2012-01-01	116378933847.142000
2012-04-01	121012255918.388000
2012-07-01	118792700232.700000
2012-10-01	118959068510.442000
2013-01-01	114677795195.207000
2013-04-01	121762190310.533000
2013-07-01	118739089072.454000
2013-10-01	117888728014.003000
2014-01-01	111170977216.071000
2014-04-01	123736674355.746000
2014-07-01	122099841966.470000
2014-10-01	118054353371.324000
2015-01-01	105972831895.627990
2015-04-01	113369671330.947000
2015-07-01	107060320226.074000
2015-10-01	103233536448.618990
2016-01-01	97474695256.402390
2016-04-01	107425376107.487000
2016-07-01	107050088308.388990
2016-10-01	101409960744.079000
2017-01-01	103941343064.944000
2017-04-01	112746482655.169000
2017-07-01	112393678847.537000
2017-10-01	112937551517.389000
2018-01-01	113520585145.394000
2018-04-01	123128528934.665000