Quarter	US Dollars, sum over component sub-periods
1981-01-01	831975035.16971990
1981-04-01	5150491467.81743050
1981-07-01	3398018879.33477000
1981-10-01	2861280668.48431970
1982-01-01	2582212294.74811000
1982-04-01	2369048146.91144040
1982-07-01	-1757937357.23890000
1982-10-01	1045359350.62573000
1983-01-01	974568499.16595400
1983-04-01	1793623855.73224000
1983-07-01	-92469522.03882070
1983-10-01	180860727.29034400
1984-01-01	3939653802.56877000
1984-04-01	3922514667.50755000
1984-07-01	-2258944138.81172040
1984-10-01	-1179050321.63327000
1985-01-01	2746972682.56940030
1985-04-01	-3369915904.24565000
1985-07-01	545317028.03125700
1985-10-01	-758919813.74753200
1986-01-01	7179219785.67500000
1986-04-01	-2080795871.24703000
1986-07-01	-312521480.10973800
1986-10-01	2096867330.05044000
1987-01-01	-1275203453.58460000
1987-04-01	-2771812266.72074000
1987-07-01	170157667.59877400
1987-10-01	1209407700.19883010
1988-01-01	-5232678592.73001000
1988-04-01	-1650161025.64992000
1988-07-01	-1500778131.52866000
1988-10-01	649121768.47932300
1989-01-01	5419447120.03426900
1989-04-01	-7541108823.97333000
1989-07-01	1433463362.01756000
1989-10-01	2020134207.50634000
1990-01-01	-3148572881.09102000
1990-04-01	939870123.45920690
1990-07-01	2707687595.06406000
1990-10-01	2043180927.22753000
1991-01-01	-4278555139.10994960
1991-04-01	-2753091515.08751960
1991-07-01	1107576023.55937000
1991-10-01	-697550123.33033000
1992-01-01	-5764120320.87768000
1992-04-01	2507337014.80377000
1992-07-01	5106847229.71968100
1992-10-01	-5519551700.80566000
1993-01-01	-492944454.71458900
1993-04-01	-5938565513.47159000
1993-07-01	5203637046.90561000
1993-10-01	-7005388159.75335000
1994-01-01	2449028731.85966000
1994-04-01	7103003809.59575900
1994-07-01	137099055.98581800
1994-10-01	2901986486.73666000
1995-01-01	2688612150.58294000
1995-04-01	2428229238.45132970
1995-07-01	-1069587772.50062010
1995-10-01	-1187091751.29271980
1996-01-01	-1467777481.40696000
1996-04-01	10549291416.75450100
1996-07-01	-1060380896.26356000
1996-10-01	6518720178.39353000
1997-01-01	10438741748.65620000
1997-04-01	5215478651.44589000
1997-07-01	-6695435705.91984000
1997-10-01	2016221006.02049000
1998-01-01	-7011602966.63964900
1998-04-01	-1559723877.10655000
1998-07-01	-5102202792.60508900
1998-10-01	-269787033.15483700
1999-01-01	-17354572800.54790000
1999-04-01	-4037297275.68732000
1999-07-01	6827491737.59353000
1999-10-01	-163685443.02488800
2000-01-01	-4210674909.63547000
2000-04-01	6105023358.24737000
2000-07-01	161962408.41518400
2000-10-01	-1232879638.72007010
2001-01-01	-3083570519.70801000
2001-04-01	-2704992558.72342000
2001-07-01	-2356651156.90300000
2001-10-01	15380195619.11330000
2002-01-01	4245066794.00801040
2002-04-01	-3536720141.11802000
2002-07-01	666069555.41521800
2002-10-01	3138112958.31896000
2003-01-01	15233476806.31350000
2003-04-01	-5159838271.37060000
2003-07-01	-3684807309.97674000
2003-10-01	4675405178.90547000
2004-01-01	-2692886596.66963000
2004-04-01	10180601171.71640000
2004-07-01	-3697764938.41404000
2004-10-01	-84396793.69486289
2005-01-01	8272270997.80905000
2005-04-01	1038902433.03104980
2005-07-01	10536019358.76100000
2005-10-01	-7089861670.05341100
2006-01-01	14431044044.35710100
2006-04-01	18738628356.23270000
2006-07-01	8921353804.99487000
2006-10-01	-15315318425.99190000
2007-01-01	10771702780.91080000
2007-04-01	14858347911.44340000
2007-07-01	17967781968.09330000
2007-10-01	9756330441.72861100
2008-01-01	18158498040.18760000
2008-04-01	6167423241.35741000
2008-07-01	-661892491.78292300
2008-10-01	8824398659.52994000
2009-01-01	464090978.76626900
2009-04-01	368453441.43971700
2009-07-01	15440452744.80400000
2009-10-01	15679543103.81990000
2010-01-01	28389578062.33260000
2010-04-01	4481832066.64101000
2010-07-01	-7100851609.89265100
2010-10-01	16644257477.42260200
2011-01-01	9713851589.39380000
2011-04-01	24863469988.08740000
2011-07-01	-6817996523.39715000
2011-10-01	8653859339.97097000
2012-01-01	-7123385427.81704000
2012-04-01	2421433065.90622000
2012-07-01	25360092560.76120000
2012-10-01	10872163584.26859900
2013-01-01	-5090093116.72468000
2013-04-01	-5322937281.33480000
2013-07-01	-14420566745.26840000
2013-10-01	16227073663.97460000
2014-01-01	-2336663426.60213000
2014-04-01	17506964416.03840300
2014-07-01	-3836025060.69022000
2014-10-01	2130284273.18582000
2015-01-01	13461474796.32230000
2015-04-01	-9907256752.35926000
2015-07-01	7786093944.92883000
2015-10-01	13910275258.82430000
2016-01-01	1771142147.56406000
2016-04-01	33759844101.42889800
2016-07-01	6345316000.03245000
2016-10-01	22008125515.18129700
2017-01-01	-12268622666.46820000
2017-04-01	1420421101.07958000
2017-07-01	-338328480.77694400
2017-10-01	42217064925.91460400
2018-01-01	-18985189300.65810000
2018-04-01	-2017154384.05704000