Quarter	US Dollars, sum over component sub-periods
1988-07-01	729664939.235862000
1988-10-01	1140165510.018600000
1989-01-01	-274967892.511113000
1989-04-01	1083007605.921219800
1989-07-01	1486807005.855250100
1989-10-01	-134367964.035546000
1990-01-01	2959965549.417510000
1990-04-01	-707533997.042704000
1990-07-01	447611959.957688000
1990-10-01	-7026743.590418680
1991-01-01	588963527.527676000
1991-04-01	-198140040.425810000
1991-07-01	-836403899.989062000
1991-10-01	1071369916.440540000
1992-01-01	-375598322.126662970
1992-04-01	-473652352.868343000
1992-07-01	374118375.489365000
1992-10-01	-603832747.163813000
1993-01-01	728105284.012857900
1993-04-01	474511131.112286030
1993-07-01	211945192.250549020
1993-10-01	-374348929.356705000
1994-01-01	-78525012.644789590
1994-04-01	3525606975.053360000
1994-07-01	-2576225394.143910000
1994-10-01	783196008.349844000
1995-01-01	599514419.668846000
1995-04-01	269062474.839789000
1995-07-01	1568824316.226290000
1995-10-01	864926906.234825000
1996-01-01	1088567107.606770000
1996-04-01	2069038406.451710200
1996-07-01	375055611.378448000
1996-10-01	2170635723.626780000
1997-01-01	4939337229.654070000
1997-04-01	-3468100340.243200300
1997-07-01	1142875869.588340000
1997-10-01	4434058319.429420000
1998-01-01	388554189.666943000
1998-04-01	434012015.983245000
1998-07-01	-786725766.341870000
1998-10-01	991988832.058597900
1999-01-01	3374138584.788240400
1999-04-01	-283213753.000416000
1999-07-01	-782674270.167431000
1999-10-01	680060008.598919000
2000-01-01	2139977111.903459800
2000-04-01	-1746143118.574250000
2000-07-01	405887726.108704000
2000-10-01	4240038181.279460400
2001-01-01	1635164564.144780000
2001-04-01	-2432552260.990250000
2001-07-01	-936221961.966543000
2001-10-01	1073392745.372199900
2002-01-01	3072958359.391130400
2002-04-01	-158679194.317628000
2002-07-01	-600247211.764954100
2002-10-01	1227628642.275490000
2003-01-01	-1939048871.932000200
2003-04-01	1036280359.111910000
2003-07-01	2210840903.307359700
2003-10-01	2673336032.117530000
2004-01-01	2721675376.010040300
2004-04-01	2614429343.520930300
2004-07-01	3806348643.376480000
2004-10-01	-3750038213.693510000
2005-01-01	-2752073678.533479700
2005-04-01	4241673228.629130000
2005-07-01	4731369209.721330000
2005-10-01	-2979369465.633799600
2006-01-01	-66532348.785733400
2006-04-01	11241433190.728400000
2006-07-01	6726921136.707601000
2006-10-01	-1691921053.289860000
2007-01-01	5076458387.625680000
2007-04-01	5721533624.832880000
2007-07-01	-1295969289.655890000
2007-10-01	-7089273926.861389000
2008-01-01	12342775251.783900000
2008-04-01	12017000324.573900000
2008-07-01	9935932911.206530000
2008-10-01	6926089229.620610000
2009-01-01	5528004140.736900000
2009-04-01	1886166058.922720000
2009-07-01	1680144648.658140200
2009-10-01	-11810714.612444099
2010-01-01	-3108234243.740100000
2010-04-01	9018838412.354460000
2010-07-01	-7133742432.128859500
2010-10-01	11810350418.482399000
2011-01-01	8505240568.773430000
2011-04-01	18872404952.691902000
2011-07-01	16391757377.895400000
2011-10-01	-15813277408.157400000
2012-01-01	7780476571.474680000
2012-04-01	-30284979.778662600
2012-07-01	3099607392.315150000
2012-10-01	5183780939.703119000
2013-01-01	-1518745669.866480000
2013-04-01	18034549363.849300000
2013-07-01	20794497077.479797000
2013-10-01	14861936738.746302000
2014-01-01	6774561784.842790000
2014-04-01	17153543156.186901000
2014-07-01	-1900565577.319110000
2014-10-01	-7005955828.433100000
2015-01-01	25943165571.797200000
2015-04-01	19692466838.419400000
2015-07-01	5928263247.923740000
2015-10-01	6644427991.700729000
2016-01-01	-13750816341.754600000
2016-04-01	2772863917.897360000
2016-07-01	-10328587735.931600000
2016-10-01	15485580556.487900000
2017-01-01	-9090587939.689620000
2017-04-01	12917285479.686699000
2017-07-01	-16280368855.376000000
2017-10-01	-4477603982.618790000
2018-01-01	21062251954.459800000
2018-04-01	3842256810.789220000