Quarter	US Dollars, sum over component sub-periods
1999-01-01	-406571125.37636500
1999-04-01	2722928261.08160970
1999-07-01	2029801472.56626990
1999-10-01	-2775303179.19931000
2000-01-01	3586040401.75645000
2000-04-01	-141763230.58066198
2000-07-01	5033607167.41105000
2000-10-01	5526376209.19741100
2001-01-01	4543680111.72002000
2001-04-01	1505571350.08568000
2001-07-01	1346602713.30856000
2001-10-01	2076423146.05842020
2002-01-01	4501228653.60873000
2002-04-01	-1370961371.76362010
2002-07-01	3399626695.73390000
2002-10-01	-9819283345.86682000
2003-01-01	2123107593.47698020
2003-04-01	5839050476.07860000
2003-07-01	-8610037996.73500000
2003-10-01	-1488448743.71634000
2004-01-01	530313558.83191997
2004-04-01	8710796494.82286000
2004-07-01	8360544883.56556000
2004-10-01	-8350551856.40365900
2005-01-01	2740562630.14851000
2005-04-01	3181893244.96296020
2005-07-01	-1860348614.97724000
2005-10-01	814235439.22051900
2006-01-01	5216726519.17311000
2006-04-01	634475570.90609300
2006-07-01	-393452020.65927800
2006-10-01	6883701701.84799000
2007-01-01	12904783527.34820000
2007-04-01	-16676272736.07740000
2007-07-01	6064438435.15178000
2007-10-01	12677488441.76330000
2008-01-01	22708629901.41510000
2008-04-01	15187734623.31210100
2008-07-01	124909145.32894899
2008-10-01	-5751778523.71349050
2009-01-01	4507129212.91833000
2009-04-01	7400281698.85930100
2009-07-01	-9849611769.05159000
2009-10-01	29948594333.96280000
2010-01-01	-14430075217.69640000
2010-04-01	41069730432.94100000
2010-07-01	-27254239279.42040000
2010-10-01	48668216348.64720000
2011-01-01	32496762369.46310000
2011-04-01	5309567276.23914000
2011-07-01	60148544478.33330000
2011-10-01	20084343877.67900000
2012-01-01	33344195398.32919700
2012-04-01	8370175069.07361000
2012-07-01	3329085949.71247000
2012-10-01	-30199370232.64910000
2013-01-01	-24482696293.16240000
2013-04-01	-15897927403.06180000
2013-07-01	-7509988131.43906000
2013-10-01	11456766192.48160000
2014-01-01	-549773031.79607310
2014-04-01	10351199627.92020000
2014-07-01	2745908160.04268000
2014-10-01	-17459187020.54150000
2015-01-01	25196079063.46669800
2015-04-01	-1133698930.78940000
2015-07-01	-9258216161.23663900
2015-10-01	-40480459886.67970000
2016-01-01	42406808830.03270000
2016-04-01	-1113408372.41062000
2016-07-01	3798428760.24696970
2016-10-01	-44910583528.60660000
2017-01-01	34740358102.32180000
2017-04-01	-22543227922.99939700
2017-07-01	15359988055.69810100
2017-10-01	-17593289869.45540000
2018-01-01	4893390673.27028000
2018-04-01	2276397322.23484000