Quarter	US Dollars, sum over component sub-periods
1997-01-01	1108281982.8849900
1997-04-01	-26342921.2975368
1997-07-01	7897107931.3898000
1997-10-01	7836008793.7037300
1998-01-01	23390717003.7080000
1998-04-01	-665616924.6920500
1998-07-01	-635374804.7588079
1998-10-01	-4451647738.7550400
1999-01-01	-2417874666.0979900
1999-04-01	6583553796.1495000
1999-07-01	1483864994.6689800
1999-10-01	13727060526.5857000
2000-01-01	7126074283.4782600
2000-04-01	7582184908.3293500
2000-07-01	7582807802.6868600
2000-10-01	750367795.0467070
2001-01-01	27785592040.8659020
2001-04-01	3963593525.2400800
2001-07-01	-6434382619.2646600
2001-10-01	-16036009147.6642000
2002-01-01	8352524317.2111410
2002-04-01	-3708805481.8370500
2002-07-01	-20352510513.5226970
2002-10-01	9394385016.1176000
2003-01-01	29700103494.5312000
2003-04-01	5313700637.5052500
2003-07-01	-13872597140.9957000
2003-10-01	11884743826.2361980
2004-01-01	10862551892.2454990
2004-04-01	-14491880490.0448000
2004-07-01	-8728693008.6392800
2004-10-01	22876804645.1590000
2005-01-01	25943154205.0639000
2005-04-01	26708119465.4922000
2005-07-01	10991361564.5951000
2005-10-01	8112620407.4250100
2006-01-01	27718370499.2866020
2006-04-01	5402091925.0285000
2006-07-01	40873381439.9818040
2006-10-01	42806754240.0644000
2007-01-01	43661450860.9740000
2007-04-01	82896055348.8063000
2007-07-01	-15365608821.6138000
2007-10-01	39626298641.9079060
2008-01-01	-5580822736.5721400
2008-04-01	77849851192.1987900
2008-07-01	-6945728225.2543800
2008-10-01	-83489703834.7587900
2009-01-01	25222333272.2230000
2009-04-01	-5395542240.8274700
2009-07-01	-29489615764.4380000
2009-10-01	-48430750375.7692950
2010-01-01	35115890603.2242000
2010-04-01	40182918343.2669000
2010-07-01	6160603093.7928400
2010-10-01	48233738085.4450000
2011-01-01	1260581903.0580502
2011-04-01	16631078849.8084010
2011-07-01	113739362521.0720000
2011-10-01	45900758527.9716000
2012-01-01	81104206071.2836000
2012-04-01	51617276455.5017000
2012-07-01	-36402961721.2018000
2012-10-01	-54157343478.5492000
2013-01-01	-4995606920.4355200
2013-04-01	6311945644.7516800
2013-07-01	-15483323562.2251000
2013-10-01	-47810479646.0947950
2014-01-01	-59865849619.6337000
2014-04-01	-44158613165.7167000
2014-07-01	33666723076.6835000
2014-10-01	22977526924.8129000
2015-01-01	7089844783.3845610
2015-04-01	5765826854.8342705
2015-07-01	24154961665.6280020
2015-10-01	14301060477.9017000
2016-01-01	34858293257.6935000
2016-04-01	29726648482.4642000
2016-07-01	31637206877.3567000
2016-10-01	6502768032.5129800
2017-01-01	68092295304.5017900
2017-04-01	-20033536922.8880000
2017-07-01	19905266674.4128000
2017-10-01	-3557280549.8711300
2018-01-01	15945915965.9355000
2018-04-01	102187725948.6740000