Quarter	Billions of US Dollars
1999-01-01	0.00750
1999-04-01	0.05914
1999-07-01	0.06199
1999-10-01	0.14776
2000-01-01	0.14146
2000-04-01	0.25139
2000-07-01	0.22767
2000-10-01	1.09956
2001-01-01	1.27885
2001-04-01	2.52187
2001-07-01	3.83053
2001-10-01	4.11540
2002-01-01	4.51767
2002-04-01	5.77356
2002-07-01	4.29441
2002-10-01	4.81777
2003-01-01	4.78805
2003-04-01	5.07025
2003-07-01	5.33199
2003-10-01	5.69825
2004-01-01	5.87575
2004-04-01	5.82649
2004-07-01	5.18816
2004-10-01	4.80906
2005-01-01	4.81351
2005-04-01	4.69109
2005-07-01	4.78426
2005-10-01	4.71590
2006-01-01	4.79883
2006-04-01	4.84902
2006-07-01	3.80599
2006-10-01	3.81274
2007-01-01	3.54734
2007-04-01	3.78378
2007-07-01	4.59350
2007-10-01	4.27436
2008-01-01	4.42668
2008-04-01	4.09492
2008-07-01	3.47155
2008-10-01	3.23416
2009-01-01	2.99328
2009-04-01	2.98421
2009-07-01	2.96480
2009-10-01	2.83421
2010-01-01	2.50693
2010-04-01	2.37787
2010-07-01	2.45553
2010-10-01	2.26304
2011-01-01	2.12962
2011-04-01	1.96482
2011-07-01	1.83806
2011-10-01	1.78111
2012-01-01	1.65602
2012-04-01	1.49618
2012-07-01	1.52861
2012-10-01	1.50737
2013-01-01	1.46869
2013-04-01	1.02098
2013-07-01	1.05124
2013-10-01	1.05979
2014-01-01	1.06382
2014-04-01	1.06868
2014-07-01	1.01807
2014-10-01	0.94184
2015-01-01	0.79473
2015-04-01	0.80652