Quarter	US Dollars, sum over component sub-periods
1999-01-01	-32148996778.924297
1999-04-01	-21283979176.654800
1999-07-01	-33644227192.156002
1999-10-01	-31218138452.272800
2000-01-01	-33524918483.448795
2000-04-01	-29315797557.624200
2000-07-01	-29661525104.200600
2000-10-01	-34431849192.711105
2001-01-01	-34573401565.073900
2001-04-01	-31847129782.820000
2001-07-01	-26994601387.710900
2001-10-01	-32283664082.185200
2002-01-01	-34834221026.292600
2002-04-01	-31318047794.345900
2002-07-01	-30053042184.114403
2002-10-01	-35145657218.843100
2003-01-01	-42954463220.165890
2003-04-01	-38600525707.717000
2003-07-01	-41072577614.422400
2003-10-01	-36760686322.017000
2004-01-01	-56976520784.970300
2004-04-01	-41411719798.590000
2004-07-01	-46639019298.882100
2004-10-01	-46124566330.719200
2005-01-01	-68383700188.452100
2005-04-01	-44721631427.589500
2005-07-01	-51680399472.912895
2005-10-01	-47763266382.906800
2006-01-01	-58286639602.693300
2006-04-01	-42397699921.553300
2006-07-01	-54459674611.261900
2006-10-01	-50525428660.396904
2007-01-01	-77361355857.140610
2007-04-01	-45559560399.737400
2007-07-01	-57723876267.126100
2007-10-01	-65617454491.737790
2008-01-01	-89257808542.968890
2008-04-01	-55113676026.670906
2008-07-01	-62223093597.751800
2008-10-01	-61437454591.676600
2009-01-01	-73512529153.734500
2009-04-01	-59520086218.404594
2009-07-01	-64478636036.437200
2009-10-01	-69630769587.405700
2010-01-01	-89254895140.857400
2010-04-01	-53828605743.403500
2010-07-01	-68324659356.697200
2010-10-01	-69417291189.473190
2011-01-01	-89284249837.614200
2011-04-01	-56445211446.619804
2011-07-01	-68878633150.676800
2011-10-01	-69394661890.320700
2012-01-01	-91193791497.486700
2012-04-01	-59527662507.603300
2012-07-01	-62482801809.407900
2012-10-01	-65367071112.623200
2013-01-01	-89660368910.932890
2013-04-01	-63181632211.951600
2013-07-01	-70357661817.296500
2013-10-01	-65121207949.668200
2014-01-01	-92301205409.362000
2014-04-01	-59962495785.596405
2014-07-01	-66752305552.556190
2014-10-01	-75599394255.125990
2015-01-01	-90175187710.433100
2015-04-01	-55596080532.093300
2015-07-01	-64500230926.918700
2015-10-01	-68955479294.410900
2016-01-01	-86437441131.099700
2016-04-01	-54800159044.232000
2016-07-01	-75451061411.201200
2016-10-01	-73969820716.956300
2017-01-01	-76446039458.943010
2017-04-01	-71609789667.745910
2017-07-01	-72505270239.718800
2017-10-01	-72825645969.537600
2018-01-01	-87017554047.475390