Quarter	US Dollars, sum over component sub-periods
1988-07-01	682512440.42434410
1988-10-01	-504223305.01926500
1989-01-01	1434909371.38107010
1989-04-01	1658695293.14334000
1989-07-01	2562223366.86656000
1989-10-01	2132700824.51768000
1990-01-01	193556806.41060498
1990-04-01	-856569388.38503190
1990-07-01	1980319339.09078000
1990-10-01	2995735017.38182970
1991-01-01	-1205157865.44302000
1991-04-01	-207391715.46514700
1991-07-01	-744775382.85542900
1991-10-01	408029039.81397800
1992-01-01	763992579.07527600
1992-04-01	2313697013.29128030
1992-07-01	556062663.56915300
1992-10-01	455143296.12809900
1993-01-01	671780158.26846700
1993-04-01	-1105339984.77254000
1993-07-01	-791618636.03990400
1993-10-01	1115719673.79445000
1994-01-01	-3242870792.46591040
1994-04-01	3719743541.58599000
1994-07-01	343840314.10837597
1994-10-01	-2123767768.06149030
1995-01-01	1387404941.27853010
1995-04-01	-49449319.70028560
1995-07-01	-1722296260.20494990
1995-10-01	319484246.50715400
1996-01-01	481874390.23315600
1996-04-01	1099473701.43759010
1996-07-01	647464423.85332110
1996-10-01	-670764631.60461100
1997-01-01	3547328045.05243970
1997-04-01	389786493.57200300
1997-07-01	884901959.47547500
1997-10-01	3525110950.98476030
1998-01-01	495189987.86027205
1998-04-01	2818251686.99973960
1998-07-01	2275287436.69997000
1998-10-01	5488672337.27959900
1999-01-01	864170608.56168400
1999-04-01	4808108138.49554000
1999-07-01	2877612881.92065000
1999-10-01	5040293384.45027100
2000-01-01	2050417209.19486000
2000-04-01	-769976064.76941410
2000-07-01	1083513845.12068990
2000-10-01	1949161413.48800020
2001-01-01	6142729355.84266000
2001-04-01	-2880195204.46505000
2001-07-01	-3831024370.10625000
2001-10-01	3938332752.92978000
2002-01-01	1438020142.88540000
2002-04-01	6812185967.16372000
2002-07-01	752908079.66141900
2002-10-01	3265681826.68015000
2003-01-01	626781240.86609400
2003-04-01	5967567574.16976900
2003-07-01	-4227517452.20101000
2003-10-01	5777555140.89763000
2004-01-01	-1070132423.38474990
2004-04-01	-4123797978.18206020
2004-07-01	-5798191168.64692000
2004-10-01	9853590424.32074000
2005-01-01	6016956117.04213000
2005-04-01	-1379312218.36762000
2005-07-01	6735671955.81637000
2005-10-01	1708548366.54829000
2006-01-01	-710417635.36766410
2006-04-01	8361081908.94383900
2006-07-01	-187657642.50882798
2006-10-01	634855622.91022200
2007-01-01	2102609933.16466020
2007-04-01	14453438369.52990000
2007-07-01	-3122184837.69387000
2007-10-01	18159987892.87770000
2008-01-01	-6690459387.04894000
2008-04-01	14702010521.09420000
2008-07-01	28861729730.42770000
2008-10-01	8407906559.72225100
2009-01-01	-11189077602.70590000
2009-04-01	-4765530670.61152000
2009-07-01	-5747644063.33226000
2009-10-01	4619806446.48294100
2010-01-01	-22657320411.43070200
2010-04-01	2179361676.15327000
2010-07-01	-13662685258.74580000
2010-10-01	1584784919.46027000
2011-01-01	13392812906.49750000
2011-04-01	21976376993.20559700
2011-07-01	11479371277.70300000
2011-10-01	-31847266415.96759800
2012-01-01	7297230264.21466000
2012-04-01	9681098535.91248100
2012-07-01	6472404042.06291000
2012-10-01	12958933036.40070000
2013-01-01	-8512450097.67954100
2013-04-01	1028879590.49526990
2013-07-01	8573917124.58531950
2013-10-01	16407081340.43580000
2014-01-01	7803699925.50701000
2014-04-01	11153908555.75820000
2014-07-01	-4053615048.85141000
2014-10-01	-7608030157.43907000
2015-01-01	12417759371.42389900
2015-04-01	9434514386.82001900
2015-07-01	12597015457.93830000
2015-10-01	11324403879.64510000
2016-01-01	3281313773.79500000
2016-04-01	14483329017.09700000
2016-07-01	1000714607.41556000
2016-10-01	321616675.96501200
2017-01-01	-7679678983.80881000
2017-04-01	2006568618.20376000
2017-07-01	-14693214416.35319900
2017-10-01	10988037099.12480000
2018-01-01	-702677659.71142400
2018-04-01	-4475945273.96766000