Quarter	US Dollars, sum over component sub-periods
2000-01-01	409399837.50000000
2000-04-01	358146106.28999996
2000-07-01	1060057324.97000000
2000-10-01	1205074052.14000000
2001-01-01	644859825.94999990
2001-04-01	1858644426.20999980
2001-07-01	419163063.03599995
2001-10-01	1679761511.16000000
2002-01-01	7115001.81000003
2002-04-01	-696779501.36000000
2002-07-01	177248366.36000000
2002-10-01	-692259144.72000000
2003-01-01	107251791.64000000
2003-04-01	387999241.74000000
2003-07-01	323416583.76000000
2003-10-01	142878251.41000000
2004-01-01	73954153.85000000
2004-04-01	745608999.29000010
2004-07-01	1708881341.79000000
2004-10-01	1455804191.72000000
2005-01-01	366810840.90000004
2005-04-01	-368072734.73499995
2005-07-01	679756291.57400000
2005-10-01	7642240647.42999900
2006-01-01	-387150054.09999996
2006-04-01	698450539.19999990
2006-07-01	3048132987.90000000
2006-10-01	1840523178.01000000
2007-01-01	2608287423.19000000
2007-04-01	1990084093.50000000
2007-07-01	1617831551.11000000
2007-10-01	2593338041.50000000
2008-01-01	1216580059.60000000
2008-04-01	1093554143.10000000
2008-07-01	1596623164.89999990
2008-10-01	845532313.49000000
2009-01-01	2369183917.45000030
2009-04-01	730478474.60000000
2009-07-01	3822406797.01000000
2009-10-01	2161794440.60000040
2010-01-01	437162449.50000000
2010-04-01	2729742868.35000040
2010-07-01	5103215941.80000000
2010-10-01	2578502162.44000000
2011-01-01	5005093699.74000100
2011-04-01	2476996623.37000040
2011-07-01	5003370976.98900000
2011-10-01	4671279365.07000000
2012-01-01	3768806612.49000020
2012-04-01	900307494.10000000
2012-07-01	3613810939.99000000
2012-10-01	325228982.51000000
2013-01-01	4461583052.96999900
2013-04-01	5778468874.70000000
2013-07-01	8159773335.34999900
2013-10-01	2237784612.56000000
2014-01-01	4293140189.40000000
2014-04-01	5932835999.90000100
2014-07-01	5020347263.23000000
2014-10-01	2564387507.00000000
2015-01-01	4195854340.67000000
2015-04-01	1251942871.00000000
2015-07-01	1705061436.10000010
2015-10-01	-499072603.15000004
2016-01-01	3996117767.95000030
2016-04-01	3243830637.30000000
2016-07-01	937710601.59000000
2016-10-01	3952545285.10000000
2017-01-01	1379397607.08000000
2017-04-01	479918019.59999996
2017-07-01	4804965711.81000000
2017-10-01	3132924754.67000000
2018-01-01	1999373420.20000000
2018-04-01	213286059.53000000