Quarter	US Dollars, sum over component sub-periods
1981-01-01	1740193502.5654700
1981-04-01	6004735598.5341600
1981-07-01	4635762521.6373800
1981-10-01	5819084445.4684105
1982-01-01	913947657.1738180
1982-04-01	3602592551.7652597
1982-07-01	264971432.2614190
1982-10-01	1773130895.4281000
1983-01-01	3414249173.4994500
1983-04-01	4408512982.3636100
1983-07-01	502093281.9476320
1983-10-01	1305588375.1271698
1984-01-01	5146401782.9350600
1984-04-01	4696491515.8713100
1984-07-01	-712389391.4850991
1984-10-01	620991777.1174580
1985-01-01	5128962980.7414610
1985-04-01	-3239236756.3123800
1985-07-01	1305233209.9508300
1985-10-01	1068431523.8432300
1986-01-01	7951960749.5983200
1986-04-01	-321400264.7361780
1986-07-01	129194792.0084140
1986-10-01	5230615337.0817500
1987-01-01	4218038152.7420406
1987-04-01	-261732273.0209790
1987-07-01	2794367030.1220900
1987-10-01	4289355809.3432703
1988-01-01	1719241051.5016100
1988-04-01	5621927908.0762800
1988-07-01	-804515490.1801189
1988-10-01	4877520839.4281800
1989-01-01	6367430904.1888700
1989-04-01	-4203845505.7846403
1989-07-01	5412487030.6267805
1989-10-01	5488844108.9170600
1990-01-01	-3001498604.2293200
1990-04-01	2288156536.9306900
1990-07-01	7677417116.3279600
1990-10-01	5001617364.6290400
1991-01-01	-1554501331.3749700
1991-04-01	2733078523.6693800
1991-07-01	5814992666.7063300
1991-10-01	1188125146.9351200
1992-01-01	-1005409319.3752500
1992-04-01	7406480991.6424000
1992-07-01	3278038205.4826600
1992-10-01	-2551386229.7723500
1993-01-01	3510049823.0400600
1993-04-01	-2185240968.3718300
1993-07-01	7473422731.9690600
1993-10-01	2797172446.5875800
1994-01-01	7736128495.6492100
1994-04-01	10319540266.8643000
1994-07-01	7824126445.0629890
1994-10-01	3511469420.4909700
1995-01-01	10031466434.9222010
1995-04-01	6785187106.2431200
1995-07-01	6007395047.7551790
1995-10-01	3898232353.4687200
1996-01-01	5311747960.0767200
1996-04-01	14513427456.5295000
1996-07-01	8997547192.0395600
1996-10-01	17679391011.9293000
1997-01-01	22231062413.2763020
1997-04-01	10333586314.3777000
1997-07-01	451945519.9380870
1997-10-01	10856083325.9752000
1998-01-01	8627353595.4516600
1998-04-01	5423443946.6248290
1998-07-01	8781733117.2139000
1998-10-01	19673052045.0769000
1999-01-01	-9736718683.2632390
1999-04-01	3976198107.2306400
1999-07-01	17257540487.8658030
1999-10-01	15257385029.5066010
2000-01-01	17042290309.3157000
2000-04-01	34661802236.6370000
2000-07-01	13627786981.4009000
2000-10-01	28848465932.2834000
2001-01-01	18388864941.3827000
2001-04-01	19239900298.3511000
2001-07-01	9568353214.0887090
2001-10-01	23421080928.5871000
2002-01-01	15918059360.1503010
2002-04-01	8089539463.9728100
2002-07-01	12023803155.9681000
2002-10-01	16156980768.3438990
2003-01-01	19065039486.5860000
2003-04-01	-732825851.5788480
2003-07-01	4166159278.0712800
2003-10-01	22709653801.0338020
2004-01-01	6820259007.2359800
2004-04-01	34991125091.2802000
2004-07-01	11298258828.3745000
2004-10-01	12094142475.1085000
2005-01-01	25183853217.1517000
2005-04-01	15623741697.9823990
2005-07-01	37286157317.4231000
2005-10-01	8245947020.4814900
2006-01-01	41101623043.5021000
2006-04-01	52039964989.5015950
2006-07-01	38156780949.6247000
2006-10-01	16060587259.8124000
2007-01-01	56244164401.5942000
2007-04-01	51344311892.7109000
2007-07-01	25564531867.3920970
2007-10-01	32013150252.9387000
2008-01-01	55353168127.1084000
2008-04-01	28276344291.3959000
2008-07-01	24597459817.8228000
2008-10-01	6275329588.0194700
2009-01-01	19453280680.8809000
2009-04-01	6784684533.3015790
2009-07-01	47893566544.7117000
2009-10-01	12244345106.9879000
2010-01-01	35690908271.6826000
2010-04-01	14853182546.8797000
2010-07-01	3813170788.6140800
2010-10-01	42141633406.7239000
2011-01-01	30251969998.4128000
2011-04-01	27581878795.3787000
2011-07-01	18233037409.2763980
2011-10-01	36901362468.5555000
2012-01-01	9577106972.0973590
2012-04-01	13604969184.2801000
2012-07-01	62345361712.1356000
2012-10-01	45288908637.6439000
2013-01-01	11808143556.7181000
2013-04-01	3800702280.5419200
2013-07-01	22666804839.3547000
2013-10-01	40677236436.0523000
2014-01-01	29960593315.1021000
2014-04-01	29929249567.8326000
2014-07-01	25206459143.1084980
2014-10-01	49604562419.0738000
2015-01-01	32466052085.7396000
2015-04-01	40936381386.2675000
2015-07-01	37237674466.6918950
2015-10-01	53923662893.5523000
2016-01-01	9662297461.8239690
2016-04-01	58236895207.5200000
2016-07-01	33917580740.5383030
2016-10-01	49557046252.9826050
2017-01-01	46598851130.5880050
2017-04-01	21445383922.4251000
2017-07-01	22571456923.9090000
2017-10-01	87795478882.4892000
2018-01-01	-2117986263.6988100
2018-04-01	27315244965.6756000