Quarter	US Dollars, sum over component sub-periods
1990-01-01	-927828997.59234200
1990-04-01	-912436816.51323200
1990-07-01	-1350803235.72975000
1990-10-01	-1621521506.76348000
1991-01-01	-3474666383.11447000
1991-04-01	-461705603.60647100
1991-07-01	-757036922.00178600
1991-10-01	-934976105.52213600
1992-01-01	-2405294503.54382040
1992-04-01	-2255001931.24759000
1992-07-01	-22054847.43144070
1992-10-01	-21132724.28659410
1993-01-01	-2811164236.19412000
1993-04-01	-826091395.17374300
1993-07-01	-684227241.86027800
1993-10-01	-1265375155.54864980
1994-01-01	-2073611602.10093020
1994-04-01	1305500951.00466000
1994-07-01	-1336824499.10920000
1994-10-01	-935119443.58263490
1995-01-01	-1585185318.57995000
1995-04-01	1521678595.36642000
1995-07-01	562708073.39043400
1995-10-01	485474979.18200900
1996-01-01	-328638691.03207500
1996-04-01	-1306140323.77449000
1996-07-01	-1140455615.58112000
1996-10-01	-1650071840.18602000
1997-01-01	-973185012.46025800
1997-04-01	-2144488980.97752000
1997-07-01	-77500064.07449180
1997-10-01	270572905.35782800
1998-01-01	-1919701178.30180000
1998-04-01	338068793.56867000
1998-07-01	-3061774748.96831040
1998-10-01	-1539761315.97874000
1999-01-01	-1594057992.38812020
1999-04-01	-1157001612.79013000
1999-07-01	-242007051.28569200
1999-10-01	-1843364572.68703000
2000-01-01	-2175088007.31882000
2000-04-01	90022403.56038230
2000-07-01	-312630812.85771400
2000-10-01	-2495664166.85628030
2001-01-01	-258806972.16675997
2001-04-01	1615253886.88234020
2001-07-01	-358738036.95671200
2001-10-01	-2066142258.33051970
2002-01-01	-1054973822.88747010
2002-04-01	318013385.15682900
2002-07-01	-2761212810.10144000
2002-10-01	-3515966172.18130000
2003-01-01	-717163098.71396300
2003-04-01	-3920790581.20605000
2003-07-01	-2205933979.79575000
2003-10-01	1083320512.53874020
2004-01-01	2052024398.86846020
2004-04-01	-2545425117.32610000
2004-07-01	-1750030329.81508000
2004-10-01	-7356141015.49960000
2005-01-01	-3369843080.79021020
2005-04-01	-3451244021.07730000
2005-07-01	-5026335946.58350000
2005-10-01	3336255815.59284000
2006-01-01	-4801102645.58368000
2006-04-01	-9493338220.47099900
2006-07-01	-3594316205.80068000
2006-10-01	-4347945290.74481000
2007-01-01	-13014727189.30729900
2007-04-01	-5280542459.69385050
2007-07-01	-20057725636.25280000
2007-10-01	-14792549538.67520100
2008-01-01	-23126858325.29730000
2008-04-01	-452277230.25808305
2008-07-01	-2042502259.42200000
2008-10-01	259820511.26059797
2009-01-01	1250840456.56547000
2009-04-01	9394000000.00000000
2009-07-01	-4811000000.76093000
2009-10-01	-6363999998.94677000
2010-01-01	-2800999999.27423000
2010-04-01	-10134200046.42570000
2010-07-01	504918696.42376995
2010-10-01	-8862013309.55698000
2011-01-01	-4987036584.23452000
2011-04-01	-12576054119.78550000
2011-07-01	-14221907772.67420000
2011-10-01	-985630640.50843190
2012-01-01	-1424563701.74617000
2012-04-01	-15380232781.66140000
2012-07-01	-5500270240.08799000
2012-10-01	-20016601523.56920000
2013-01-01	-4169600757.19206000
2013-04-01	-14052120598.05540000
2013-07-01	4634449340.86076900
2013-10-01	-14537284927.01660200
2014-01-01	4237895572.55698000
2014-04-01	3171992450.98526000
2014-07-01	-1042277626.00877010
2014-10-01	-10602464822.90150000
2015-01-01	-10036073725.95570000
2015-04-01	-9410591626.65899800
2015-07-01	-6473922482.43322900
2015-10-01	645964637.21505090
2016-01-01	6362509638.38683000
2016-04-01	1963540193.30219980
2016-07-01	11023716493.62690000
2016-10-01	-4567624781.86488000
2017-01-01	8395296463.39180000
2017-04-01	-8535017721.92710100
2017-07-01	-3486063760.02065000
2017-10-01	-13342465964.79959900
2018-01-01	-16468187463.10380200
2018-04-01	-5153463619.22290000