Quarter	US Dollars, sum over component sub-periods
1990-01-01	1192906218.80322000
1990-04-01	508773615.72908500
1990-07-01	1949584140.36687020
1990-10-01	1772013563.81998000
1991-01-01	3904832792.81195000
1991-04-01	-278329019.03595805
1991-07-01	1873743060.13899000
1991-10-01	935864902.81194900
1992-01-01	1378731943.24745000
1992-04-01	1649285438.39320000
1992-07-01	-307802240.24720000
1992-10-01	1054673065.07904000
1993-01-01	2478388716.23237000
1993-04-01	491558516.13644200
1993-07-01	276464144.82432800
1993-10-01	510070987.88093900
1994-01-01	2105743321.75039980
1994-04-01	-1188734579.37967010
1994-07-01	854175293.37172590
1994-10-01	98683508.25554301
1995-01-01	1619920138.51556000
1995-04-01	-1436803077.33711000
1995-07-01	-139975581.69102800
1995-10-01	151552673.97769300
1996-01-01	2199115766.64388000
1996-04-01	1935404384.19920000
1996-07-01	2234540071.31191000
1996-10-01	2766665594.07707000
1997-01-01	1896423079.61380980
1997-04-01	3152136056.55422000
1997-07-01	1073064998.92253000
1997-10-01	1545537158.88326000
1998-01-01	2669430024.71331020
1998-04-01	1124197120.35100000
1998-07-01	3623213980.38073000
1998-10-01	2005732099.83765980
1999-01-01	3261698035.11986970
1999-04-01	594522981.52078010
1999-07-01	569119531.83417400
1999-10-01	861538046.04644300
2000-01-01	1408369484.73894000
2000-04-01	787072450.27225900
2000-07-01	369832791.28347400
2000-10-01	5209219095.38018000
2001-01-01	514821835.92010200
2001-04-01	-243055627.11798600
2001-07-01	627633018.10517300
2001-10-01	550040292.51833300
2002-01-01	676903804.81406390
2002-04-01	84966967.38936470
2002-07-01	-152680520.53769100
2002-10-01	1554645113.11762000
2003-01-01	-476643425.50253700
2003-04-01	2654943229.17936000
2003-07-01	1184917828.52450000
2003-10-01	-1621134530.42924000
2004-01-01	-1613993988.68458000
2004-04-01	3720579380.45285000
2004-07-01	37045702.69848700
2004-10-01	4557137699.39794100
2005-01-01	6433794369.94375000
2005-04-01	2219033633.32739970
2005-07-01	6190396992.27011000
2005-10-01	-1900200902.29804020
2006-01-01	5690921416.23294000
2006-04-01	6964244479.06167000
2006-07-01	5107996259.11051100
2006-10-01	7262951507.70562100
2007-01-01	10751768832.32920000
2007-04-01	8489998641.91064100
2007-07-01	12236387220.73849900
2007-10-01	8602105124.45168900
2008-01-01	16102890951.46259900
2008-04-01	7812104897.58946000
2008-07-01	3088422394.27923000
2008-10-01	-2651317592.80842000
2009-01-01	-1243206030.39305000
2009-04-01	-9212000000.00000000
2009-07-01	4913000000.54352000
2009-10-01	6800000000.03762100
2010-01-01	2983999999.27423000
2010-04-01	15727749416.09200000
2010-07-01	4721173549.87900100
2010-10-01	16965595332.40459800
2011-01-01	8488723529.82753900
2011-04-01	21101106681.31970000
2011-07-01	19607659009.09040000
2011-10-01	1245911729.18097000
2012-01-01	6148597655.94440000
2012-04-01	18107061655.53340000
2012-07-01	13799506878.24040000
2012-10-01	21069287141.99970000
2013-01-01	10007083369.89850000
2013-04-01	29541495448.30909700
2013-07-01	15083541608.89250000
2013-10-01	32582530950.70930000
2014-01-01	15520862038.15610000
2014-04-01	15654477845.25500000
2014-07-01	15337640286.72520000
2014-10-01	22303729462.70210000
2015-01-01	22992978147.01609800
2015-04-01	21087474748.82470000
2015-07-01	19926651227.17400000
2015-10-01	11402910947.00740000
2016-01-01	6550136343.38278000
2016-04-01	10619762040.87189900
2016-07-01	4752696402.83918000
2016-10-01	32927682421.85410000
2017-01-01	8512766629.54204100
2017-04-01	21575057477.94900000
2017-07-01	19089565997.01410000
2017-10-01	28091835099.90800000
2018-01-01	34981344730.12990600