Quarter	US Dollars, sum over component sub-periods
1990-01-01	265077221.210876020
1990-04-01	-403663200.784148000
1990-07-01	598780904.637120000
1990-10-01	150492057.056503980
1991-01-01	430166409.697484970
1991-04-01	-740034622.642429000
1991-07-01	1116706138.137210100
1991-10-01	888797.289812322
1992-01-01	-1026562560.296370000
1992-04-01	-605716492.854384000
1992-07-01	-329857087.678640000
1992-10-01	1033540340.792440000
1993-01-01	-332775519.961750000
1993-04-01	-334532879.037300940
1993-07-01	-407763097.035950000
1993-10-01	-755304167.667707000
1994-01-01	32131719.649471004
1994-04-01	116766371.624995990
1994-07-01	-482649205.737472000
1994-10-01	-836435935.327092000
1995-01-01	34734819.935604500
1995-04-01	84875518.029308900
1995-07-01	422732491.699406000
1995-10-01	637027653.159702100
1996-01-01	1870477075.611800000
1996-04-01	629264060.424702000
1996-07-01	1094084455.730780100
1996-10-01	1116593753.891050000
1997-01-01	923238067.153556000
1997-04-01	1007647075.576700000
1997-07-01	995564934.848039000
1997-10-01	1816110064.241080000
1998-01-01	749728846.411509000
1998-04-01	1462265913.919670000
1998-07-01	561439231.412425000
1998-10-01	465970783.858917000
1999-01-01	1667640042.731750000
1999-04-01	-562478631.269346000
1999-07-01	327112480.548482000
1999-10-01	-981826526.640584000
2000-01-01	-766718522.579884000
2000-04-01	877094853.832641000
2000-07-01	57201978.425760500
2000-10-01	2713554928.523900000
2001-01-01	256014863.753343000
2001-04-01	1372198259.764350000
2001-07-01	268894981.148461000
2001-10-01	-1516101965.812190000
2002-01-01	-378070018.073407050
2002-04-01	402980352.546194000
2002-07-01	-2913893330.639130000
2002-10-01	-1961321059.063680000
2003-01-01	-1193806524.216500000
2003-04-01	-1265847352.026690000
2003-07-01	-1021016151.271250000
2003-10-01	-537814017.890503000
2004-01-01	438030410.183876000
2004-04-01	1175154263.126750000
2004-07-01	-1712984627.116590000
2004-10-01	-2799003316.101660000
2005-01-01	3063951289.153540000
2005-04-01	-1232210387.749910000
2005-07-01	1164061045.686610000
2005-10-01	1436054913.294799800
2006-01-01	889818770.649268000
2006-04-01	-2529093741.409330000
2006-07-01	1513680053.309830200
2006-10-01	2915006216.960820000
2007-01-01	-2262958356.978130000
2007-04-01	3209456182.216789700
2007-07-01	-7821338415.514360000
2007-10-01	-6190444414.223479000
2008-01-01	-7023967373.834780000
2008-04-01	7359827667.331370000
2008-07-01	1045920134.857230100
2008-10-01	-2391497081.547820000
2009-01-01	7634426.172420170
2009-04-01	182000000.000000000
2009-07-01	102000000.009783000
2009-10-01	436000000.018808000
2010-01-01	183000000.000000000
2010-04-01	5593549369.666280000
2010-07-01	5226092246.302770000
2010-10-01	8103582022.847590000
2011-01-01	3501686945.593020000
2011-04-01	8525052561.534160000
2011-07-01	5385751229.862730000
2011-10-01	260281082.584866000
2012-01-01	4724033954.198231000
2012-04-01	2726828877.568750400
2012-07-01	8299236641.774330000
2012-10-01	1052685622.124070000
2013-01-01	5837482607.167850000
2013-04-01	15489374846.677700000
2013-07-01	19717990951.359800000
2013-10-01	18045246007.577400000
2014-01-01	19758757607.475800000
2014-04-01	18826470294.568000000
2014-07-01	14295362660.716400000
2014-10-01	11701264638.185900000
2015-01-01	12956904421.060300000
2015-04-01	11676883123.741200000
2015-07-01	13452728744.740799000
2015-10-01	12048875584.980900000
2016-01-01	12912645981.769600000
2016-04-01	12583302234.174099000
2016-07-01	15776412891.986000000
2016-10-01	28360057635.539803000
2017-01-01	16908063088.456999000
2017-04-01	13040039760.676100000
2017-07-01	15603502240.104400000
2017-10-01	14749369128.928700000
2018-01-01	18513157282.567500000