Quarter	US Dollars, sum over component sub-periods
1999-01-01	-1082778196.77102000
1999-04-01	3406631609.18585970
1999-07-01	-3551237108.54284000
1999-10-01	1080492081.31139000
2000-01-01	3713950133.02207000
2000-04-01	-4011079707.30897000
2000-07-01	3493224649.29212000
2000-10-01	3646166096.63295000
2001-01-01	-3443333317.99598000
2001-04-01	-4323292568.81986000
2001-07-01	-10567674607.42130000
2001-10-01	-3356783677.08674000
2002-01-01	130835173.35359702
2002-04-01	-4423709815.02952000
2002-07-01	3204855107.55567030
2002-10-01	-1494932218.54455020
2003-01-01	12507001487.08350000
2003-04-01	3903222792.46765000
2003-07-01	7579688872.20825000
2003-10-01	-3288317457.23951000
2004-01-01	11751248608.72570000
2004-04-01	7479288827.11784000
2004-07-01	9414929234.02493900
2004-10-01	-15317687662.77360000
2005-01-01	11543923947.01410100
2005-04-01	13256301526.46980000
2005-07-01	-26992555683.27480000
2005-10-01	4247160326.63982960
2006-01-01	8818983994.12719000
2006-04-01	-5039065043.08690000
2006-07-01	-26921391810.45319700
2006-10-01	-43633966562.24880000
2007-01-01	-5552730819.43886000
2007-04-01	54343193833.25910000
2007-07-01	52415138906.94220000
2007-10-01	56969402055.22700500
2008-01-01	148722984563.93100000
2008-04-01	72933931136.95540000
2008-07-01	-30688653458.41350000
2008-10-01	115277650333.24199000
2009-01-01	-16523570084.43510000
2009-04-01	-24265514845.15210300
2009-07-01	-25535075157.50030000
2009-10-01	-68499626729.37980000
2010-01-01	-39773860981.71310000
2010-04-01	-33473052449.57200200
2010-07-01	-2451417179.64287000
2010-10-01	1816812165.46115000
2011-01-01	66679479473.60990000
2011-04-01	-20072094859.66740000
2011-07-01	-19489903538.02710300
2011-10-01	-60995559057.56480400
2012-01-01	-27464730684.67350000
2012-04-01	-25527203921.69239800
2012-07-01	15367489941.28000000
2012-10-01	6365202835.64458900
2013-01-01	92800127684.23880000
2013-04-01	112382204211.06300000
2013-07-01	-96635838790.56800000
2013-10-01	28040218388.60690000
2014-01-01	68786436932.95580000
2014-04-01	-19008054184.63379700
2014-07-01	-66692198055.62270000
2014-10-01	32689604422.54710000
2015-01-01	-151116405680.47702000
2015-04-01	44940169034.92810000
2015-07-01	9258331400.74422000
2015-10-01	6858854781.92484950
2016-01-01	47654531301.95370000
2016-04-01	-32315345095.95280000
2016-07-01	12595433701.01700000
2016-10-01	9898337103.14410000
2017-01-01	10561728698.12040000
2017-04-01	16526533625.87749900
2017-07-01	27380137770.85339700
2017-10-01	13883869567.43090000
2018-01-01	41688574182.34720000