Quarter	US Dollars, sum over component sub-periods
1981-01-01	3097494164.1716600
1981-04-01	3160035905.4247603
1981-07-01	3136442389.5948200
1981-10-01	2802527472.0062100
1982-01-01	3166973374.9489100
1982-04-01	2939612659.9057200
1982-07-01	2996338582.9440800
1982-10-01	2764882074.2268700
1983-01-01	2917186644.6606300
1983-04-01	3255817216.3835200
1983-07-01	3464362531.8228400
1983-10-01	3154566346.0864997
1984-01-01	3463326876.9852400
1984-04-01	3503019215.6943900
1984-07-01	3432559995.2967900
1984-10-01	3039750957.8313704
1985-01-01	3492452896.8546400
1985-04-01	3593311542.6120200
1985-07-01	3693016261.2628903
1985-10-01	3401729403.9323500
1986-01-01	3736102760.0757303
1986-04-01	3978863052.6552800
1986-07-01	4008647345.3336797
1986-10-01	3787935955.0429100
1987-01-01	4095451185.3400000
1987-04-01	4396952196.9111700
1987-07-01	4465693454.0922700
1987-10-01	4257328619.3001704
1988-01-01	4780578949.5402790
1988-04-01	5252064229.9133700
1988-07-01	5364256698.5404300
1988-10-01	5076231584.8810300
1989-01-01	5869110224.7306100
1989-04-01	6062722964.2835200
1989-07-01	6102579127.0316910
1989-10-01	5760933341.4401500
1990-01-01	6651307382.9007400
1990-04-01	6860197473.8672495
1990-07-01	7223968313.1840310
1990-10-01	6455866242.0362400
1991-01-01	7013854643.7330200
1991-04-01	7390014613.6657200
1991-07-01	7635018934.3074400
1991-10-01	7143723548.3993700
1992-01-01	7705307570.9552310
1992-04-01	7814184873.5153400
1992-07-01	7659022226.6749400
1992-10-01	6520297293.4151200
1993-01-01	7742080993.7408700
1993-04-01	7946688607.9660200
1993-07-01	8250977693.0009390
1993-10-01	7166197263.9701300
1994-01-01	8290625567.0136595
1994-04-01	8071003310.2312300
1994-07-01	7508361066.1169300
1994-10-01	6937435839.4840400
1995-01-01	7882425046.4472890
1995-04-01	7973050598.5666090
1995-07-01	8381879902.7065510
1995-10-01	7735266809.1999810
1996-01-01	8673761653.8068790
1996-04-01	8431666064.6380205
1996-07-01	8928947189.1154210
1996-10-01	8462120572.2928010
1997-01-01	9240383023.5990600
1997-04-01	8856432355.2902810
1997-07-01	9446816499.0253500
1997-10-01	8658892113.5008890
1998-01-01	9460387656.6730700
1998-04-01	9259521590.3193200
1998-07-01	9170755440.1711000
1998-10-01	8642912958.7848900
1999-01-01	9394603448.8438400
1999-04-01	9558625465.2223700
1999-07-01	10235516056.5756990
1999-10-01	10004508613.0980000
2000-01-01	10795102314.0949000
2000-04-01	10684973366.2386000
2000-07-01	11174731337.2792990
2000-10-01	10324465746.4744990
2001-01-01	10974422244.3767990
2001-04-01	10537078233.0699000
2001-07-01	10692633098.6096000
2001-10-01	9930958752.1684900
2002-01-01	10207359100.1650000
2002-04-01	10971811937.0564000
2002-07-01	11508095123.6293010
2002-10-01	10853091983.5628000
2003-01-01	11723309473.6598000
2003-04-01	12052265787.5385000
2003-07-01	13173385488.2741000
2003-10-01	13506303791.8991000
2004-01-01	14306149791.6082000
2004-04-01	13984528268.4781000
2004-07-01	14610569055.5247000
2004-10-01	14762883805.8286000
2005-01-01	16201155475.2003000
2005-04-01	15961465399.1226000
2005-07-01	16648722127.3584000
2005-10-01	16365806618.8086990
2006-01-01	17971240743.5940970
2006-04-01	18408973901.5062980
2006-07-01	18840707700.7414000
2006-10-01	17723177567.5346000
2007-01-01	18866697168.7205000
2007-04-01	20314175979.3920000
2007-07-01	21087414435.2402000
2007-10-01	22293490086.4139020
2008-01-01	23863379082.7345000
2008-04-01	23801919793.1738000
2008-07-01	23151848245.1896000
2008-10-01	19062746959.3735000
2009-01-01	20031387090.4167020
2009-04-01	20398610760.2649000
2009-07-01	21197013723.2693980
2009-10-01	21634075721.9846000
2010-01-01	24658683839.0261000
2010-04-01	24885987865.5836000
2010-07-01	24496879374.7083000
2010-10-01	24384074077.1587000
2011-01-01	26674303393.6125000
2011-04-01	28396058248.1136000
2011-07-01	27532253924.9457970
2011-10-01	24825459552.7288000
2012-01-01	28118889602.5120000
2012-04-01	28459263196.5136000
2012-07-01	28445799990.5711980
2012-10-01	26892812281.4886000
2013-01-01	29063301445.9811000
2013-04-01	29206784902.8893000
2013-07-01	28274054186.6937000
2013-10-01	26351609234.0534020
2014-01-01	27952041665.2378000
2014-04-01	29155952685.3217000
2014-07-01	27997380895.4278000
2014-10-01	25914499020.8987000
2015-01-01	26414999836.9136000
2015-04-01	27154246664.4972000
2015-07-01	24759901023.5379000
2015-10-01	23233724883.0889970
2016-01-01	24575416259.6034000
2016-04-01	26126238892.6552000
2016-07-01	25280836744.3603000
2016-10-01	23817853953.4468000
2017-01-01	26595744140.6642000
2017-04-01	26087409321.8695030
2017-07-01	27230655035.3631000
2017-10-01	26403856825.2059020
2018-01-01	28705473403.7477000
2018-04-01	28812618016.5137020