Quarter	US Dollars, sum over component sub-periods
1991-01-01	20263610093.4213000
1991-04-01	1507145781.7426698
1991-07-01	-1078949704.6736100
1991-10-01	5295394998.8731600
1992-01-01	7209206852.4731900
1992-04-01	6037230310.3512310
1992-07-01	29291375479.6858980
1992-10-01	3188126167.4804800
1993-01-01	11389003139.9095000
1993-04-01	6744658179.3461500
1993-07-01	7279712194.2496100
1993-10-01	17253426350.5081000
1994-01-01	17749026800.8352000
1994-04-01	10087709223.1160010
1994-07-01	16445348487.1116000
1994-10-01	34680631594.9728000
1995-01-01	33033626375.7800000
1995-04-01	29817932516.8313980
1995-07-01	21754557621.9512000
1995-10-01	15353139583.2846000
1996-01-01	12039974940.4154010
1996-04-01	15463895387.3448000
1996-07-01	-7771786647.6767010
1996-10-01	28133026755.9620970
1997-01-01	52754921648.4069000
1997-04-01	41221877286.7899900
1997-07-01	-3488304252.8481402
1997-10-01	36245224583.6021040
1998-01-01	54534730062.1289100
1998-04-01	41680660054.2650000
1998-07-01	8835901035.6758000
1998-10-01	72113591595.5313000
1999-01-01	52465859746.2488000
1999-04-01	19955670928.8101000
1999-07-01	20849614009.9000970
1999-10-01	27086709936.7029000
2000-01-01	93184922886.4869000
2000-04-01	1986366215.0531500
2000-07-01	6351087264.6029410
2000-10-01	26924552886.9251000
2001-01-01	126040390899.1060000
2001-04-01	-11018720095.5197010
2001-07-01	-1341610673.5928700
2001-10-01	-33699443933.2476960
2002-01-01	17399339068.8504000
2002-04-01	11678185175.7621000
2002-07-01	37879868286.8406100
2002-10-01	-14703863320.7540000
2003-01-01	49044998490.9691000
2003-04-01	6074747971.2223300
2003-07-01	-781205973.3731770
2003-10-01	-16611035624.1747000
2004-01-01	79368262398.7791000
2004-04-01	-59443948573.6445000
2004-07-01	37803958416.3213000
2004-10-01	6309904610.7910390
2005-01-01	108445713142.6910100
2005-04-01	-3805737124.8538504
2005-07-01	29309484504.9905000
2005-10-01	-19419860139.6328000
2006-01-01	92588234852.2582100
2006-04-01	20739860133.7588000
2006-07-01	35513919998.8666000
2006-10-01	-6108985357.7094200
2007-01-01	76048621191.2276000
2007-04-01	70872541433.8905000
2007-07-01	106181636479.3520000
2007-10-01	-51523172475.3776000
2008-01-01	222738501005.6860000
2008-04-01	-12293397184.5300000
2008-07-01	60233799024.2322000
2008-10-01	-160537321160.2210000
2009-01-01	-41244877079.4770050
2009-04-01	-13923277100.0051000
2009-07-01	-53738158956.0734000
2009-10-01	-53974215842.4473000
2010-01-01	63220226740.3359000
2010-04-01	119360663177.3210000
2010-07-01	29314235363.2269970
2010-10-01	55675925892.8092040
2011-01-01	-59269225051.5906000
2011-04-01	-25898713355.5563000
2011-07-01	187707929996.1999800
2011-10-01	-73044021452.2558900
2012-01-01	278821690698.1610000
2012-04-01	60015406821.8706000
2012-07-01	-25529999829.3617000
2012-10-01	-156817500228.6970000
2013-01-01	-26358226054.5747000
2013-04-01	1308621877.9311400
2013-07-01	-91249481867.9579000
2013-10-01	-141932852760.2299800
2014-01-01	32446407896.7270000
2014-04-01	44340990445.8161000
2014-07-01	20421494074.9195980
2014-10-01	-41391263994.7084050
2015-01-01	196585027735.4180000
2015-04-01	-81571020629.9689000
2015-07-01	30378243854.7013000
2015-10-01	-84461500725.9042000
2016-01-01	98278388392.6200900
2016-04-01	109950770601.6729900
2016-07-01	5059364277.0152100
2016-10-01	5315352892.1932910
2017-01-01	161305099220.5500200
2017-04-01	-41019480684.5562000
2017-07-01	10044243603.9402000
2017-10-01	-16579447249.9787000
2018-01-01	72346483103.1562000
2018-04-01	49249278330.9667000