Quarter	US Dollars, sum over component sub-periods
1999-01-01	-22215622951.16500000
1999-04-01	27779441456.32029700
1999-07-01	22923362361.85210000
1999-10-01	21123227723.56750000
2000-01-01	21369908254.71410000
2000-04-01	14324045189.06170000
2000-07-01	6390438019.77654100
2000-10-01	11666061942.66199900
2001-01-01	-2830454835.02458000
2001-04-01	3429610207.44015030
2001-07-01	26565364439.81419800
2001-10-01	4861635958.73964000
2002-01-01	2000643149.31691000
2002-04-01	30362404145.56099700
2002-07-01	12016845975.02100000
2002-10-01	1841181754.65767980
2003-01-01	24654391839.53110000
2003-04-01	42878106290.24090600
2003-07-01	63274186488.36390000
2003-10-01	52012697842.44170000
2004-01-01	142343396195.39800000
2004-04-01	7548866914.41601000
2004-07-01	951945331.04604100
2004-10-01	4558062746.76493000
2005-01-01	563771975.17513190
2005-04-01	3029395756.93838020
2005-07-01	-674965633.33308200
2005-10-01	-4552819241.21167900
2006-01-01	8352046741.38126900
2006-04-01	9609360304.08192000
2006-07-01	10759920832.46430000
2006-10-01	7904428754.42538100
2007-01-01	13417785295.53770000
2007-04-01	12777850611.32000000
2007-07-01	13447748267.31040000
2007-10-01	6958771845.96507000
2008-01-01	10641025412.65880000
2008-04-01	11277719741.65930000
2008-07-01	1666424216.75578000
2008-10-01	9774587710.88128900
2009-01-01	-9235064827.16203100
2009-04-01	12183695333.89470100
2009-07-01	128199710649.59900000
2009-10-01	-922641946.17372300
2010-01-01	10103747041.89270000
2010-04-01	11619717162.26380000
2010-07-01	36634789489.88600000
2010-10-01	11813608157.67249900
2011-01-01	36116940800.14160000
2011-04-01	10481483776.90460000
2011-07-01	49899458276.81100000
2011-10-01	109453771067.76399000
2012-01-01	-4202813514.22079040
2012-04-01	-7301603224.27442100
2012-07-01	2091799554.78578000
2012-10-01	-1719769098.51438000
2013-01-01	6042245981.96414000
2013-04-01	15722863726.07120000
2013-07-01	27817473463.29990000
2013-10-01	-312736575.77078503
2014-01-01	15209970117.60200100
2014-04-01	371731656.61244600
2014-07-01	-1708975804.41791000
2014-10-01	4319113818.01433900
2015-01-01	22763671492.72020000
2015-04-01	263539155.72858100
2015-07-01	14116826175.59579800
2015-10-01	8423894606.19772900
2016-01-01	4081335542.62702000
2016-04-01	3695122783.50129030
2016-07-01	5343727198.13974000
2016-10-01	1406718682.75630000
2017-01-01	11869864586.08440000
2017-04-01	11232351535.55520000
2017-07-01	9519200075.36452100
2017-10-01	-3216685686.17636000
2018-01-01	13405308202.70470000