Quarter	Billions of US Dollars
1998-07-01	0.0240
1998-10-01	0.0235
1999-01-01	0.0165
1999-04-01	0.0161
1999-07-01	0.0148
1999-10-01	0.0159
2000-01-01	0.0163
2000-04-01	0.0158
2000-07-01	0.0154
2000-10-01	0.0146
2001-01-01	0.0132
2001-04-01	0.0123
2004-01-01	0.0197
2004-04-01	0.1103
2004-07-01	0.1206
2004-10-01	0.4120
2005-01-01	1.1791
2005-04-01	2.3289
2005-07-01	4.6647
2005-10-01	5.4940
2006-01-01	7.1460
2006-04-01	7.6429
2006-07-01	8.5394
2006-10-01	10.7296
2007-01-01	13.6791
2007-04-01	19.0249
2007-07-01	20.8902
2007-10-01	21.5611
2008-01-01	22.6197
2008-04-01	25.4876
2008-07-01	21.3479
2008-10-01	17.2003
2009-01-01	17.5159
2009-04-01	19.3647
2009-07-01	22.6739
2009-10-01	23.9060
2010-01-01	24.5151
2010-04-01	26.8951
2010-07-01	30.6799
2010-10-01	35.0419
2011-01-01	40.2570
2011-04-01	48.6203
2011-07-01	45.8788
2011-10-01	46.3639
2012-01-01	47.7277
2012-04-01	44.4103
2012-07-01	46.4957
2012-10-01	47.4809
2013-01-01	50.0604
2013-04-01	47.2479
2013-07-01	48.7172
2013-10-01	47.5855
2014-01-01	49.5924
2014-04-01	52.9266
2014-07-01	48.0320
2014-10-01	44.4265
2015-01-01	36.4227
2015-04-01	36.8217