Quarter	US Dollars, sum over component sub-periods
1990-01-01	203652592.636091000
1990-04-01	-334761968.826276960
1990-07-01	-1092856329.041810000
1990-10-01	-1573034536.139470000
1991-01-01	890212132.489766000
1991-04-01	-1105472391.203380000
1991-07-01	675777458.554956000
1991-10-01	1583373050.120440000
1992-01-01	2231409423.598870000
1992-04-01	357435303.205871000
1992-07-01	-614252607.184241000
1992-10-01	-12779716.690617898
1993-01-01	1139792015.300020000
1993-04-01	260295037.198678020
1993-07-01	921706531.488001000
1993-10-01	2339294380.017180000
1994-01-01	5202437802.968170000
1994-04-01	1174517325.286100000
1994-07-01	2330174644.356610000
1994-10-01	640407216.312529900
1995-01-01	499030994.921131970
1995-04-01	-1259315825.644160000
1995-07-01	-45453095.346440600
1995-10-01	-1296182514.652200000
1996-01-01	-334648661.967032000
1996-04-01	639224049.670217000
1996-07-01	891543757.533911000
1996-10-01	1497157870.732430000
1997-01-01	2789865787.095010300
1997-04-01	2970168754.638530300
1997-07-01	496061477.462480000
1997-10-01	-1571992347.443740100
1998-01-01	1997952359.498970000
1998-04-01	-1861402508.286110200
1998-07-01	1778246958.919740200
1998-10-01	735479102.066356000
1999-01-01	3175236182.684100000
1999-04-01	1412236961.517700000
1999-07-01	-591155759.054004000
1999-10-01	2023751258.951150000
2000-01-01	3296589081.134680000
2000-04-01	-1007933460.518640000
2000-07-01	-414054320.758774000
2000-10-01	4168662032.770679500
2001-01-01	3121147651.060050000
2001-04-01	1461958276.445639800
2001-07-01	483038547.110246000
2001-10-01	3623929733.238450000
2002-01-01	6187423529.318951000
2002-04-01	1661962052.036680000
2002-07-01	4926724667.431170000
2002-10-01	6077154958.029970000
2003-01-01	4313863729.800739000
2003-04-01	5463522119.851971000
2003-07-01	8592012858.238740000
2003-10-01	7294006461.680480000
2004-01-01	10070942362.093400000
2004-04-01	7569900073.280089000
2004-07-01	-633893135.062999000
2004-10-01	6593949170.900450000
2005-01-01	12628961111.856798000
2005-04-01	1246314415.080380000
2005-07-01	5255737910.030550000
2005-10-01	-4671639292.259980000
2006-01-01	13221252052.258600000
2006-04-01	6379034179.419040000
2006-07-01	2269980943.316610300
2006-10-01	7505035071.365379000
2007-01-01	20451972881.928900000
2007-04-01	11200114467.532000000
2007-07-01	29236003096.028700000
2007-10-01	26738087615.816902000
2008-01-01	24989954998.392800000
2008-04-01	2234979306.636280000
2008-07-01	-4733936404.218400000
2008-10-01	-17880449754.021503000
2009-01-01	299952586.195350050
2009-04-01	115000000.000000000
2009-07-01	9417999999.891300000
2009-10-01	1767000000.000000000
2010-01-01	2140999999.927420100
2010-04-01	3741067086.158560000
2010-07-01	3289455287.980640000
2010-10-01	3988949614.934520200
2011-01-01	2030997009.294600000
2011-04-01	5442634607.943199000
2011-07-01	276211396.582307000
2011-10-01	-12814271485.399100000
2012-01-01	-5737371841.365860000
2012-04-01	521803364.743023040
2012-07-01	-157898202.403596000
2012-10-01	781419726.373135900
2013-01-01	2680673084.911480000
2013-04-01	-345968514.242734000
2013-07-01	-10354822710.062200000
2013-10-01	19102824613.811100000
2014-01-01	7106402359.936120000
2014-04-01	11178852185.786000000
2014-07-01	6896811400.587510000
2014-10-01	13181674921.548300000
2015-01-01	30149009481.794003000
2015-04-01	11429938639.427200000
2015-07-01	-856181952.274864000
2015-10-01	4056420337.525920000
2016-01-01	3274499581.987409600
2016-04-01	6969157633.443710000
2016-07-01	8511507724.513751000
2016-10-01	-1241864781.114210100
2017-01-01	7311539017.784130000
2017-04-01	11404565854.579199000
2017-07-01	9498574900.452589000
2017-10-01	9434484928.345829000
2018-01-01	13236752622.372099000
2018-04-01	-11338430558.969000000