Quarter	US Dollars, sum over component sub-periods
1987-01-01	10403564985.9705000
1987-04-01	36170759584.2695000
1987-07-01	14079684185.9722000
1987-10-01	10536077179.9609000
1988-01-01	8564110075.8415510
1988-04-01	32787257775.5976030
1988-07-01	27026800867.9713000
1988-10-01	-13525309087.0766980
1989-01-01	48953061811.2827000
1989-04-01	17942248024.6109000
1989-07-01	32391245949.8473000
1989-10-01	10527466092.9248000
1990-01-01	37398719472.7749000
1990-04-01	8545705299.6401400
1990-07-01	37633336832.6855000
1990-10-01	43515662769.8435000
1991-01-01	-1151075478.6328400
1991-04-01	12704918201.6371000
1991-07-01	8606587279.7802300
1991-10-01	-6040648953.4428700
1992-01-01	15489754946.1835000
1992-04-01	7966900915.4705600
1992-07-01	67059826988.4086100
1992-10-01	25034513956.8075000
1993-01-01	43206739723.9254000
1993-04-01	39544887517.0831000
1993-07-01	28128794834.6684000
1993-10-01	93086017429.9737000
1994-01-01	-18509573922.0991020
1994-04-01	-31605963761.6223000
1994-07-01	13250961795.4622000
1994-10-01	18429859185.0880970
1995-01-01	66090871002.3763000
1995-04-01	-25416634578.0187000
1995-07-01	55213393900.0142000
1995-10-01	7872582361.5137000
1996-01-01	47990382214.7207950
1996-04-01	81286909997.9480000
1996-07-01	31722474503.2367000
1996-10-01	76722739189.8933000
1997-01-01	113620732384.2070000
1997-04-01	78711488986.8154000
1997-07-01	33777523508.6258960
1997-10-01	86847263212.1940000
1998-01-01	64214442574.2235950
1998-04-01	93670502740.7883000
1998-07-01	48611214218.6698000
1998-10-01	-84352521243.0475900
1999-01-01	129704871879.4020000
1999-04-01	-1775363670.7017899
1999-07-01	-38873586208.9184000
1999-10-01	-49192308342.3203000
2000-01-01	211218203140.0310000
2000-04-01	75865658225.1835000
2000-07-01	50239238193.1621000
2000-10-01	51503017778.0872040
2001-01-01	325884248299.3609600
2001-04-01	-15972227689.6361000
2001-07-01	14905987885.7190990
2001-10-01	19819381404.4266000
2002-01-01	14710792670.4179000
2002-04-01	5439614441.9298200
2002-07-01	28929335533.5041000
2002-10-01	40207524364.1254000
2003-01-01	218261438737.4990000
2003-04-01	166288536768.0910000
2003-07-01	17389589174.0830000
2003-10-01	32122579284.1723020
2004-01-01	367870936357.1990000
2004-04-01	42177990113.1504000
2004-07-01	208068097682.6880200
2004-10-01	124751621403.5620100
2005-01-01	376955608981.8580300
2005-04-01	207746021062.6180000
2005-07-01	144892806331.3160000
2005-10-01	47213340243.1608000
2006-01-01	478883679687.2450000
2006-04-01	105430191140.1020000
2006-07-01	93324754822.9274000
2006-10-01	96660367830.3978000
2007-01-01	736605126608.7290000
2007-04-01	346103521900.0340000
2007-07-01	301112804965.2370000
2007-10-01	183670469136.8200000
2008-01-01	368860850839.6709600
2008-04-01	-708725499613.7440000
2008-07-01	-99741171044.5518000
2008-10-01	-870797115156.9800000
2009-01-01	-195238113864.3880000
2009-04-01	-187633810538.5630200
2009-07-01	-187455573184.3870000
2009-10-01	-119589178925.8969900
2010-01-01	70508081848.5864000
2010-04-01	105855787472.1970000
2010-07-01	174807418711.1160300
2010-10-01	-117602373508.5820000
2011-01-01	153856106749.7830200
2011-04-01	9071976279.7018500
2011-07-01	66890246287.2168000
2011-10-01	-165452755994.7930000
2012-01-01	100688514407.2900000
2012-04-01	-175614941060.9040000
2012-07-01	51834174092.4060000
2012-10-01	-130388992406.0090000
2013-01-01	317687542.2783940
2013-04-01	-52315557716.1865000
2013-07-01	-306206872728.5760000
2013-10-01	-124817292540.4440000
2014-01-01	137985909591.7000000
2014-04-01	13775865216.1414990
2014-07-01	70557139351.3039000
2014-10-01	-48396594596.0512000
2015-01-01	-155955713816.9670000
2015-04-01	-240156949864.4320000
2015-07-01	-1715823417.0688200
2015-10-01	-47291738907.7030940
2016-01-01	-20661279062.9668000
2016-04-01	144934836730.0920000
2016-07-01	-23518227624.2837000
2016-10-01	-110536031928.8759900
2017-01-01	126376067803.5570000
2017-04-01	23076909794.7861020
2017-07-01	94421179365.0378000
2017-10-01	119228537539.1550000
2018-01-01	122510188990.1250000
2018-04-01	-252678170914.4720000