Quarter	US Dollars, sum over component sub-periods
2002-01-01	5443868179.03874000
2002-04-01	-1080547096.74152000
2002-07-01	745635716.25182310
2002-10-01	4465084166.87251000
2003-01-01	-2407913400.50001000
2003-04-01	-2986258866.18241020
2003-07-01	-219503119.31955302
2003-10-01	2893842309.31181000
2004-01-01	-223776819.96915102
2004-04-01	5494717494.52049000
2004-07-01	-5108345621.24876000
2004-10-01	-4188035640.87197970
2005-01-01	16154026462.88940000
2005-04-01	1709057875.51307000
2005-07-01	-2784120542.76830000
2005-10-01	2415588923.54203000
2006-01-01	9354935007.28861000
2006-04-01	2491146159.93636040
2006-07-01	3866969325.17088000
2006-10-01	6315369998.17258100
2007-01-01	10483678000.19060100
2007-04-01	6090619561.33980100
2007-07-01	5498127208.09176000
2007-10-01	19885602876.57800000
2008-01-01	5338113130.31048000
2008-04-01	30624148894.88060000
2008-07-01	-2532671626.17760000
2008-10-01	25249564350.91380000
2009-01-01	4410590621.72887000
2009-04-01	12727596613.52180100
2009-07-01	6531314783.68375000
2009-10-01	10366309956.33440000
2010-01-01	19933183754.55900000
2010-04-01	35234865216.47050000
2010-07-01	5831055414.13746000
2010-10-01	-4247055562.51006000
2011-01-01	13293533452.74780000
2011-04-01	30153275802.98450000
2011-07-01	13865488243.37620000
2011-10-01	586087529.63683400
2012-01-01	41310754231.57090000
2012-04-01	51377476428.24400000
2012-07-01	-11885302341.89180000
2012-10-01	28987740808.45610000
2013-01-01	-25850220596.47440000
2013-04-01	11974804389.97070100
2013-07-01	-7888030782.19268000
2013-10-01	-4625064335.17707900
2014-01-01	-4136146104.84992030
2014-04-01	-9903223435.17082000
2014-07-01	-860939885.11465300
2014-10-01	12763627878.78699900
2015-01-01	14876516165.83470200
2015-04-01	13279209134.69030000
2015-07-01	3081625264.04274030
2015-10-01	-5614717370.27420000
2016-01-01	3049604699.76091000
2016-04-01	-8190213919.97389000
2016-07-01	-2505132951.45548000
2016-10-01	-1926586452.71470000
2017-01-01	688349886.02582300
2017-04-01	-5737536348.63343000
2017-07-01	-15651261724.28760000
2017-10-01	-18167918438.91480000
2018-01-01	-8129025440.40254000
2018-04-01	-7182980561.52596000