Quarter	US Dollars, Sum Over Component Sub-periods
1998-01-01	1100000000
1998-04-01	800000000
1998-07-01	1100000000
1998-10-01	1700000000
1999-01-01	900000000
1999-04-01	1300000000
1999-07-01	2900000000
1999-10-01	200000000
2000-01-01	1500000000
2000-04-01	1600000000
2000-07-01	1900000000
2000-10-01	1900000000
2001-01-01	1800000000
2001-04-01	1900000000
2001-07-01	2300000000
2001-10-01	3100000000
2002-01-01	2700000000
2002-04-01	3300000000
2002-07-01	3800000000
2002-10-01	3900000000
2003-01-01	4000000000
2003-04-01	4100000000
2003-07-01	4800000000
2003-10-01	5600000000
2004-01-01	5300000000
2004-04-01	5100000000
2004-07-01	5900000000
2004-10-01	7900000000
2005-01-01	5600000000
2005-04-01	7600000000
2005-07-01	7200000000
2005-10-01	7300000000
2006-01-01	7000000000
2006-04-01	7900000000
2006-07-01	7400000000
2006-10-01	9300000000
2007-01-01	8500000000
2007-04-01	10600000000
2007-07-01	11200000000
2007-10-01	12400000000
2008-01-01	13400000000
2008-04-01	13200000000
2008-07-01	13000000000
2008-10-01	12900000000
2009-01-01	9700000000
2009-04-01	10300000000
2009-07-01	10600000000
2009-10-01	12000000000
2010-01-01	11200000000
2010-04-01	11600000000
2010-07-01	12300000000
2010-10-01	14400000000
2011-01-01	13400000000
2011-04-01	14400000000
2011-07-01	14800000000
2011-10-01	13100000000
2012-01-01	12800000000
2012-04-01	12700000000
2012-07-01	12700000000
2012-10-01	13000000000
2013-01-01	12100000000
2013-04-01	13300000000