Quarter	US Dollars, sum over component sub-periods
1981-01-01	-3811333771.386759800
1981-04-01	-5682725603.947579000
1981-07-01	-196388657.912014000
1981-10-01	-1572067671.478770000
1982-01-01	-25640160.517998498
1982-04-01	2016262483.243150000
1982-07-01	2258261058.638860000
1982-10-01	3045106608.776900000
1983-01-01	-196380441.721568000
1983-04-01	-385044251.638170000
1983-07-01	-1073133137.345259900
1983-10-01	499789241.931800000
1984-01-01	-116293864.774573000
1984-04-01	2095929305.369069800
1984-07-01	-1069345187.004880100
1984-10-01	153921038.772703020
1985-01-01	-1812351799.446669800
1985-04-01	1489304255.775810000
1985-07-01	-770940111.057666000
1985-10-01	-3156729502.264090000
1986-01-01	1667381102.044860000
1986-04-01	231119291.495678000
1986-07-01	2845172458.643390000
1986-10-01	-883081523.640389100
1987-01-01	-1756581545.090160100
1987-04-01	-235484050.798244000
1987-07-01	40837840.223705800
1987-10-01	-5997472611.641740000
1988-01-01	-1746856212.952990000
1988-04-01	-1116094132.126770000
1988-07-01	-2063364906.516999700
1988-10-01	-3031994791.034790000
1989-01-01	-1321304831.896900000
1989-04-01	-7299739704.023971000
1989-07-01	-17759723.069244098
1989-10-01	136900242.778913000
1990-01-01	-2692135470.140920000
1990-04-01	-6089503972.630700000
1990-07-01	-438709549.504455030
1990-10-01	1942442550.284580000
1991-01-01	-6263853166.658950000
1991-04-01	-225363685.969554000
1991-07-01	2409218248.563240000
1991-10-01	-2461682569.076100300
1992-01-01	-2645143606.295520000
1992-04-01	180829647.812225000
1992-07-01	3563555499.662580000
1992-10-01	-3051362848.091100000
1993-01-01	7124711652.546880000
1993-04-01	-2796100835.611220400
1993-07-01	5037237217.966830000
1993-10-01	-11248332599.651400000
1994-01-01	2105449229.307229800
1994-04-01	1300794545.697000000
1994-07-01	-2211816153.218010000
1994-10-01	-5003752574.839060000
1995-01-01	-2402831588.834039700
1995-04-01	4854270882.994141000
1995-07-01	7318930950.862830000
1995-10-01	-3242013931.946650000
1996-01-01	-739730641.126989000
1996-04-01	6303782319.812360000
1996-07-01	-2860766079.389660000
1996-10-01	-4037830761.267270000
1997-01-01	-5200979856.448160000
1997-04-01	-1971942834.055189800
1997-07-01	-802816961.934749000
1997-10-01	-9328836720.921991000
1998-01-01	-11677851646.820300000
1998-04-01	539027303.563630000
1998-07-01	-3702647101.015420000
1998-10-01	-5393146557.008720000
1999-01-01	-11752353120.480800000
1999-04-01	7327148057.254620000
1999-07-01	3357540055.912110000
1999-10-01	-2985051958.897860000
2000-01-01	-2563019510.212900000
2000-04-01	1925092589.667600000
2000-07-01	1120914834.906750000
2000-10-01	-534837738.009344000
2001-01-01	-5830775324.829881000
2001-04-01	1304806916.668939800
2001-07-01	-11394256238.978400000
2001-10-01	16918848371.457700000
2002-01-01	1523982743.518390000
2002-04-01	-1460119723.471030000
2002-07-01	-2706507415.375960400
2002-10-01	1945948624.305810000
2003-01-01	3881262991.759970000
2003-04-01	10437043183.033100000
2003-07-01	-9532073838.064960000
2003-10-01	-6122644889.625030500
2004-01-01	4260195171.112350000
2004-04-01	-3254201126.306910000
2004-07-01	2801429776.506850000
2004-10-01	4120693936.810340400
2005-01-01	-4677723740.133599000
2005-04-01	-7390520326.616390000
2005-07-01	-5273411061.652929000
2005-10-01	920097404.909599100
2006-01-01	1801714982.728860000
2006-04-01	-10368078080.138899000
2006-07-01	816059055.440398000
2006-10-01	-1080595918.060180200
2007-01-01	-17307275537.918300000
2007-04-01	-9306037064.849161000
2007-07-01	19076538186.867700000
2007-10-01	1786657297.430780200
2008-01-01	3907739029.143830300
2008-04-01	20031014936.313100000
2008-07-01	-1020657407.618880000
2008-10-01	3248619418.643440000
2009-01-01	-4677041438.258679000
2009-04-01	18456089942.256000000
2009-07-01	-8461670697.288260000
2009-10-01	18053021510.233300000
2010-01-01	13097043306.178501000
2010-04-01	29508880416.197500000
2010-07-01	-4093239617.358830000
2010-10-01	2877016754.428780000
2011-01-01	6278155881.609460000
2011-04-01	20821502958.774000000
2011-07-01	13258349526.785799000
2011-10-01	-5243548484.946820000
2012-01-01	-457575108.827518050
2012-04-01	17063876433.779900000
2012-07-01	-11176894664.328200000
2012-10-01	-19248795282.153700000
2013-01-01	533398928.086847960
2013-04-01	3015158672.944050000
2013-07-01	-11846084472.812300000
2013-10-01	-13808349933.034601000
2014-01-01	-16216154137.059200000
2014-04-01	24452876627.630900000
2014-07-01	10017563170.220001000
2014-10-01	-32826263979.954704000
2015-01-01	12966425351.848000000
2015-04-01	-19657500813.537300000
2015-07-01	-10755937002.446800000
2015-10-01	-25371347411.017300000
2016-01-01	20909377683.716602000
2016-04-01	6803190652.715529000
2016-07-01	-1274889514.081670000
2016-10-01	-1186510697.935649900
2017-01-01	-15815074540.427900000
2017-04-01	-158402981.429294000
2017-07-01	14772347086.376299000
2017-10-01	-12403873511.689100000
2018-01-01	1375623777.094410000
2018-04-01	-9986618402.174870000