Quarter	US Dollars, sum over component sub-periods
1981-01-01	4643308806.55647900
1981-04-01	10833217071.76500100
1981-07-01	3594407537.24679000
1981-10-01	4433348339.96310000
1982-01-01	2607852455.26610000
1982-04-01	352785663.66829103
1982-07-01	-4016198415.87776000
1982-10-01	-1999747258.15116000
1983-01-01	1170948940.88751980
1983-04-01	2178668107.37041000
1983-07-01	980663615.30644100
1983-10-01	-318928514.64145600
1984-01-01	4055947667.34334000
1984-04-01	1826585362.13848000
1984-07-01	-1189598951.80685000
1984-10-01	-1332971360.40597000
1985-01-01	4559324482.01606900
1985-04-01	-4859220160.02146100
1985-07-01	1316257139.08891990
1985-10-01	2397809688.51656000
1986-01-01	5511838683.63013900
1986-04-01	-2311915162.74271000
1986-07-01	-3157693938.75312000
1986-10-01	2979948853.69083000
1987-01-01	481378091.50555897
1987-04-01	-2536328215.92249000
1987-07-01	129319827.37506801
1987-10-01	7206880311.84057000
1988-01-01	-3485822379.77702000
1988-04-01	-534066893.52315100
1988-07-01	562586774.98834000
1988-10-01	3681116559.51412000
1989-01-01	6740751951.93116000
1989-04-01	-241369119.94935802
1989-07-01	1451223085.08680000
1989-10-01	1883233964.72743000
1990-01-01	-456437410.95010800
1990-04-01	7029374096.08991050
1990-07-01	3146397144.56851000
1990-10-01	100738376.94295000
1991-01-01	1985298027.54900000
1991-04-01	-2527727829.11797000
1991-07-01	-1301642225.00387000
1991-10-01	1764132445.74577000
1992-01-01	-3118976714.58216000
1992-04-01	2326507366.99155000
1992-07-01	1543291730.05710000
1992-10-01	-2468188852.71456000
1993-01-01	-7617656107.26146000
1993-04-01	-3142464677.86036000
1993-07-01	166399828.93877300
1993-10-01	4242944439.89803030
1994-01-01	343579502.55243600
1994-04-01	5802209263.89874900
1994-07-01	2348915209.20383000
1994-10-01	7905739061.57573000
1995-01-01	5091443739.41698000
1995-04-01	-2426041644.54281000
1995-07-01	-8388518723.36345000
1995-10-01	2054922180.65393000
1996-01-01	-728046840.27996800
1996-04-01	4245509096.94209000
1996-07-01	1800385183.12609000
1996-10-01	10556550939.66079900
1997-01-01	15639721605.10440000
1997-04-01	7187421485.50107000
1997-07-01	-5892618743.98509000
1997-10-01	11345057726.94250000
1998-01-01	4666248680.18070000
1998-04-01	-2098751180.67018000
1998-07-01	-1399555691.58967000
1998-10-01	5123359523.85388000
1999-01-01	-5602219680.06705000
1999-04-01	-11364445332.94190000
1999-07-01	3469951681.68142000
1999-10-01	2821366515.87298000
2000-01-01	-1647655399.42258000
2000-04-01	4179930768.57977000
2000-07-01	-958952426.49156700
2000-10-01	-698041900.71072510
2001-01-01	2747204805.12187000
2001-04-01	-4009799475.39235970
2001-07-01	9037605082.07540100
2001-10-01	-1538652752.34439000
2002-01-01	2721084050.48961000
2002-04-01	-2076600417.64699000
2002-07-01	3372576970.79117000
2002-10-01	1192164334.01315000
2003-01-01	11352213814.55350000
2003-04-01	-15596881454.40370000
2003-07-01	5847266528.08822100
2003-10-01	10798050068.53050000
2004-01-01	-6953081767.78197000
2004-04-01	13434802298.02330000
2004-07-01	-6499194714.92089000
2004-10-01	-4205090730.50520940
2005-01-01	12949994737.94260000
2005-04-01	8429422759.64743900
2005-07-01	15809430420.41400100
2005-10-01	-8009959074.96299900
2006-01-01	12629329061.62830000
2006-04-01	29106706436.37160000
2006-07-01	8105294749.55447000
2006-10-01	-14234722507.93170000
2007-01-01	28078978318.82910000
2007-04-01	24164384976.29260000
2007-07-01	-1108756218.77437000
2007-10-01	7969673144.29783000
2008-01-01	14250759011.04380000
2008-04-01	-13863591694.95570000
2008-07-01	358764915.83596100
2008-10-01	5575779240.88649900
2009-01-01	5141132417.02495000
2009-04-01	-18087636500.81620000
2009-07-01	23902123442.09230000
2009-10-01	-2373478406.41333000
2010-01-01	15292534756.15410000
2010-04-01	-25027048349.55650000
2010-07-01	-3007611992.53381970
2010-10-01	13767240722.99390000
2011-01-01	3435695707.78434000
2011-04-01	4041967029.31341000
2011-07-01	-20076346050.18290000
2011-10-01	13897407824.91780000
2012-01-01	-6665810318.98952000
2012-04-01	-14642443367.87370100
2012-07-01	36536987225.08930000
2012-10-01	30120958866.42230200
2013-01-01	-5623492044.81152000
2013-04-01	-8338095954.27884000
2013-07-01	-2574482272.45612000
2013-10-01	30035423597.00920000
2014-01-01	13879490710.45710000
2014-04-01	-6945912211.59250000
2014-07-01	-13853588230.91020000
2014-10-01	34956548253.14050000
2015-01-01	495049444.47423800
2015-04-01	9750244061.17800000
2015-07-01	18542030947.37570000
2015-10-01	39281622669.84160000
2016-01-01	-19138235536.15250000
2016-04-01	26956653448.71340000
2016-07-01	7620205514.11412000
2016-10-01	23194636213.11700000
2017-01-01	3546451873.95968000
2017-04-01	1578824082.50888010
2017-07-01	-15110675567.15330000
2017-10-01	54620938437.60370000
2018-01-01	-20360813077.75259800
2018-04-01	7969464018.11783000