Quarter	US Dollars, sum over component sub-periods
1999-01-01	9032539065.2778000
1999-04-01	5198883560.7529900
1999-07-01	7445739205.6579200
1999-10-01	7956110825.0323590
2000-01-01	6457848157.2336010
2000-04-01	2806435602.7571797
2000-07-01	5379238567.8944400
2000-10-01	4208814419.2682104
2001-01-01	3123439033.4098897
2001-04-01	2459603218.5788500
2001-07-01	5672082876.4576000
2001-10-01	3358773130.0909600
2002-01-01	3154813678.3601400
2002-04-01	3552583374.5433500
2002-07-01	3559827776.8217000
2002-10-01	6862568646.6785000
2003-01-01	12210948815.1205000
2003-04-01	6239743182.2844100
2003-07-01	3006656209.4579200
2003-10-01	-2537775797.9066900
2004-01-01	4807520866.9012400
2004-04-01	2932605962.9048500
2004-07-01	3556148015.5903200
2004-10-01	5380332338.5523300
2005-01-01	8795802636.7358800
2005-04-01	4005010100.8315500
2005-07-01	4793553626.3741600
2005-10-01	10324979460.0747000
2006-01-01	8199479562.1759090
2006-04-01	8640628307.0608500
2006-07-01	3388718030.4812600
2006-10-01	6035635438.9452400
2007-01-01	5992881082.5111210
2007-04-01	4452218700.9289800
2007-07-01	3756312510.4309700
2007-10-01	7874562872.9718000
2008-01-01	6599837728.0877200
2008-04-01	5179857350.1848700
2008-07-01	5359270130.5574700
2008-10-01	8048147650.9253400
2009-01-01	8934787766.9483200
2009-04-01	5484268093.2120200
2009-07-01	5936235486.5129900
2009-10-01	13197127031.0948000
2010-01-01	8593950820.1917920
2010-04-01	5263479190.6397200
2010-07-01	7904498822.7659090
2010-10-01	9012321265.8523400
2011-01-01	8192629651.7563700
2011-04-01	7859582290.3096090
2011-07-01	9705797351.9019400
2011-10-01	12927132890.4135000
2012-01-01	8445488965.6114500
2012-04-01	6793726752.4993200
2012-07-01	8351513443.2742710
2012-10-01	14449736908.1572000
2013-01-01	12759105407.1600000
2013-04-01	9826494677.2541000
2013-07-01	7685192124.5589200
2013-10-01	17036345954.8538020
2014-01-01	7253404160.7023800
2014-04-01	8464522507.3214410
2014-07-01	5777540374.6352610
2014-10-01	12995688371.4345000
2015-01-01	10264518003.1535000
2015-04-01	8350223036.7542510
2015-07-01	6882690044.9265400
2015-10-01	14825878942.0580000
2016-01-01	16045576598.3370000
2016-04-01	8181601538.9459600
2016-07-01	8515740608.0451800
2016-10-01	12132428411.3037000
2017-01-01	8996471454.0763700
2017-04-01	9554216668.6853790
2017-07-01	7636368193.6973400
2017-10-01	14571499835.6306000
2018-01-01	15034401793.2876000