Quarter	US Dollars, sum over component sub-periods
2002-01-01	3861552226.83827000
2002-04-01	756842774.99427100
2002-07-01	1839497083.62917000
2002-10-01	1160541705.93146000
2003-01-01	2597927074.99333000
2003-04-01	1464164198.74824000
2003-07-01	-750813233.77508500
2003-10-01	627078493.83524800
2004-01-01	3502919829.90815970
2004-04-01	3309606106.59207960
2004-07-01	3515197142.43423000
2004-10-01	-5522300011.45600000
2005-01-01	9785196365.57114000
2005-04-01	4988737421.60075000
2005-07-01	1001210234.60919000
2005-10-01	-6263166554.09766000
2006-01-01	1527680012.76283000
2006-04-01	-2499944355.25400000
2006-07-01	7761978638.85651000
2006-10-01	1444692483.24209000
2007-01-01	12277283741.09370000
2007-04-01	-1412786476.37984000
2007-07-01	3428939549.13249970
2007-10-01	8104654732.10674000
2008-01-01	5828026965.17198000
2008-04-01	6326335272.85214000
2008-07-01	16122726657.58529900
2008-10-01	11824282332.96630100
2009-01-01	8218790842.90892900
2009-04-01	9154173382.84761000
2009-07-01	7205044363.86663100
2009-10-01	3549944321.22905970
2010-01-01	14125507793.58130000
2010-04-01	16039875351.70790100
2010-07-01	-14824476209.12469900
2010-10-01	-15660762889.17899900
2011-01-01	-4889198357.19696000
2011-04-01	15111181033.67710000
2011-07-01	-368522650.86773900
2011-10-01	-5335417511.17669000
2012-01-01	-14677310604.73450000
2012-04-01	5434612382.45097000
2012-07-01	-10273566248.36089900
2012-10-01	-4154269266.11157000
2013-01-01	-23808962301.19880000
2013-04-01	-1180632911.82610000
2013-07-01	-70204136.26468709
2013-10-01	-2978116764.38124000
2014-01-01	-4037470651.05629000
2014-04-01	-3565270137.28110000
2014-07-01	-3257001811.53373960
2014-10-01	1394734136.23606010
2015-01-01	15520433475.47200000
2015-04-01	10439984592.89869900
2015-07-01	-3124981463.64508000
2015-10-01	-4064131809.23765000
2016-01-01	-2161284718.55119000
2016-04-01	-3720771386.50406030
2016-07-01	-6674031261.76179000
2016-10-01	-4548166340.55297900
2017-01-01	-2672417204.57084000
2017-04-01	-3485193154.84365000
2017-07-01	-2727167171.22886000
2017-10-01	-4036530196.94083000
2018-01-01	-3217201602.86831000
2018-04-01	-6702923983.36759000