Quarter	US Dollars, sum over component sub-periods
1991-01-01	-3019289403.54085970
1991-04-01	-6526076607.32139000
1991-07-01	-7209447714.80455000
1991-10-01	3549898168.37059000
1992-01-01	-3046007653.19775000
1992-04-01	-2419496072.60113000
1992-07-01	-3583128637.76033000
1992-10-01	-3445599539.67605000
1993-01-01	-18826548572.76840000
1993-04-01	-6160846369.19844000
1993-07-01	-5086704725.09786000
1993-10-01	2462948695.54882000
1994-01-01	-17565263629.50930000
1994-04-01	-10400780119.55150000
1994-07-01	-7587271551.72414000
1994-10-01	-1838500472.92045000
1995-01-01	-12484921167.75170000
1995-04-01	-1066026808.48016010
1995-07-01	-16631018597.56100000
1995-10-01	-7002800894.29943000
1996-01-01	-8097682260.81035000
1996-04-01	-10262999132.66310100
1996-07-01	-12486827236.51420000
1996-10-01	9869242136.55668000
1997-01-01	-13961901523.77119800
1997-04-01	-6422009077.11167050
1997-07-01	8661810994.35903000
1997-10-01	3403798691.04982000
1998-01-01	-3426466193.09435000
1998-04-01	-261916204.79464802
1998-07-01	-22898441869.43450000
1998-10-01	9750827378.55509000
1999-01-01	29939439690.88459800
1999-04-01	-11868361586.60590200
1999-07-01	-8316984645.03157000
1999-10-01	-3030622768.60957000
2000-01-01	-14187976382.35880000
2000-04-01	-37344992277.27340000
2000-07-01	14144453310.41050000
2000-10-01	-3324051078.17330030
2001-01-01	-10957386388.08980000
2001-04-01	-17694613951.96460000
2001-07-01	2983635165.79092000
2001-10-01	26625471622.68850000
2002-01-01	-5463154024.43953000
2002-04-01	-10360377525.01270000
2002-07-01	5236172714.52302000
2002-10-01	20222439225.85570000
2003-01-01	9706800252.92961000
2003-04-01	28991359848.44939800
2003-07-01	-11414162204.61670000
2003-10-01	27527199006.42250000
2004-01-01	4960594534.28821000
2004-04-01	75830476113.78500000
2004-07-01	28676672618.66170000
2004-10-01	29140074773.09470000
2005-01-01	30033096331.34580200
2005-04-01	50225913662.62980000
2005-07-01	5991407896.02307000
2005-10-01	34129857090.08480000
2006-01-01	47506036806.33269500
2006-04-01	83520011265.27310000
2006-07-01	26263272878.86330000
2006-10-01	39460743256.55540000
2007-01-01	48376221507.38280000
2007-04-01	74248130495.77510000
2007-07-01	25063980746.06469700
2007-10-01	105731473722.18300000
2008-01-01	80287438826.88980000
2008-04-01	60098623034.00330000
2008-07-01	6819769423.24200000
2008-10-01	32473106818.01530000
2009-01-01	4484750995.01458100
2009-04-01	68179662364.21689600
2009-07-01	20460781135.74510000
2009-10-01	91372672531.06920000
2010-01-01	22793433030.55160000
2010-04-01	23112516261.76140200
2010-07-01	20386724104.17080000
2010-10-01	57443157066.47110000
2011-01-01	78065841107.16770000
2011-04-01	59476077136.35940600
2011-07-01	-297924441.88924500
2011-10-01	30514276715.43680200
2012-01-01	21635656750.97480000
2012-04-01	36254686473.96270000
2012-07-01	53591476457.80180000
2012-10-01	82827122409.40541000
2013-01-01	45236236675.45980000
2013-04-01	77852553658.03690000
2013-07-01	75815168740.48360000
2013-10-01	101035469570.39300000
2014-01-01	84041335799.07460000
2014-04-01	75395864599.27959000
2014-07-01	65729448921.25329600
2014-10-01	92630574661.30020000
2015-01-01	35030452519.74609000
2015-04-01	78236286701.84200000
2015-07-01	76555931523.46300000
2015-10-01	75177684282.83139000
2016-01-01	44765375529.52250000
2016-04-01	70712723822.23700000
2016-07-01	66459112838.65719600
2016-10-01	102252390717.71100000
2017-01-01	71729041683.76820000
2017-04-01	79251026800.62750000
2017-07-01	64572318650.72839000
2017-10-01	100807278343.08800000
2018-01-01	85220205025.09980000
2018-04-01	83922943038.24660000