Quarter	US Dollars, sum over component sub-periods
2005-01-01	33898596152.19040300
2005-04-01	26630358282.53120000
2005-07-01	33498715629.96500000
2005-10-01	16842328511.96780000
2006-01-01	49343109575.93370000
2006-04-01	37541604643.24370000
2006-07-01	45488182352.94120000
2006-10-01	33593434196.90799700
2007-01-01	59682717377.43680000
2007-04-01	21975686165.76960000
2007-07-01	36820715882.97030000
2007-10-01	18433067243.69160000
2008-01-01	28641279297.27430000
2008-04-01	38198341191.89060000
2008-07-01	41896335707.62421000
2008-10-01	38365885983.86680000
2009-01-01	-16365613177.12120000
2009-04-01	-15232884820.14799900
2009-07-01	1336143442.27455000
2009-10-01	-10721517868.51920100
2010-01-01	30347105313.07819700
2010-04-01	52468683672.20759600
2010-07-01	-7906337173.37299000
2010-10-01	31218870257.87120000
2011-01-01	47750634985.23330000
2011-04-01	2612719912.64804000
2011-07-01	66182121713.10819000
2011-10-01	-19893606490.82850000
2012-01-01	64081150191.30680000
2012-04-01	11159844665.15070000
2012-07-01	18022067956.89390000
2012-10-01	-529162791.80952495
2013-01-01	10188354049.32310000
2013-04-01	37766098388.77389500
2013-07-01	19862967907.63700000
2013-10-01	38789629193.02530000
2014-01-01	36849527226.15320000
2014-04-01	11799280010.49250000
2014-07-01	10139989747.45760000
2014-10-01	51219534604.16630000
2015-01-01	29526196425.75560000
2015-04-01	10155725899.30430000
2015-07-01	33266175322.82570000
2015-10-01	-21960733337.33150000
2016-01-01	23218279127.71630000
2016-04-01	30807478566.30359600
2016-07-01	-9300682486.26211000
2016-10-01	-13240582579.48720000
2017-01-01	21799814954.22080200
2017-04-01	-9305415095.12956000
2017-07-01	1838038099.31984000
2017-10-01	8327204688.09222000
2018-01-01	-3018577825.36439000
2018-04-01	16861797290.07950000