Quarter	US Dollars, sum over component sub-periods
1999-01-01	6860747427.66522000
1999-04-01	3057178351.88772000
1999-07-01	7612279856.04390000
1999-10-01	-4696427406.83503000
2000-01-01	7818146612.75483000
2000-04-01	5031754192.15156100
2000-07-01	2756234512.95374970
2000-10-01	1381615789.48924000
2001-01-01	4974926524.46784000
2001-04-01	-1147310030.56442000
2001-07-01	1220375423.35457020
2001-10-01	3455480523.44105000
2002-01-01	-884519000.42674590
2002-04-01	-2422264725.80183030
2002-07-01	-1679155893.98662000
2002-10-01	-6861202602.82582950
2003-01-01	12727695620.29790000
2003-04-01	8731598289.97495000
2003-07-01	-1300133860.58504000
2003-10-01	-2831967391.51402000
2004-01-01	18377202533.77940000
2004-04-01	2778092525.74462030
2004-07-01	6724724968.13504000
2004-10-01	-5430326448.04681000
2005-01-01	21483662678.07330000
2005-04-01	11095032570.34110000
2005-07-01	4652395913.56158000
2005-10-01	1031174592.17672990
2006-01-01	28909239170.65280000
2006-04-01	2863184133.36783000
2006-07-01	11458158943.07390000
2006-10-01	30089590675.52530300
2007-01-01	11935082645.78980000
2007-04-01	30214487877.00510000
2007-07-01	3090720170.99032000
2007-10-01	4912351071.31090000
2008-01-01	38999838028.37840000
2008-04-01	31523894355.90840000
2008-07-01	-4524020305.61150000
2008-10-01	-12764656225.04710000
2009-01-01	-1997125841.99228000
2009-04-01	-433059675.05884300
2009-07-01	1364624245.21119000
2009-10-01	-30020951768.13090000
2010-01-01	14435471914.44360000
2010-04-01	7497050192.11569000
2010-07-01	-18944468376.73780000
2010-10-01	-23913270981.24070000
2011-01-01	31176842880.07890000
2011-04-01	-233166142.24742198
2011-07-01	1625170770.68492980
2011-10-01	820522541.49156700
2012-01-01	4222743043.89252040
2012-04-01	3655988650.86543000
2012-07-01	-868435441.70066610
2012-10-01	-8614820177.58470000
2013-01-01	5053664687.07555000
2013-04-01	7704152153.60856100
2013-07-01	-3671808787.27760000
2013-10-01	-14180082473.18270000
2014-01-01	-5281877762.78714900
2014-04-01	10173361210.95710000
2014-07-01	-14642600661.45000000
2014-10-01	-13264333687.76700000
2015-01-01	1017659524.32195000
2015-04-01	-8087421055.54349000
2015-07-01	-1723131009.83631010
2015-10-01	-9582553110.79539900
2016-01-01	10019499936.94490000
2016-04-01	-10038742830.35540000
2016-07-01	-8459426683.73452000
2016-10-01	-12685515832.10860000
2017-01-01	15153287506.46010000
2017-04-01	4426602224.12298000
2017-07-01	-1773480804.71816000
2017-10-01	-10880262257.79850000
2018-01-01	17228864198.70649700
2018-04-01	-1459229052.71464000