Quarter	Billions of US Dollars
1997-04-01	0.3440
1997-07-01	0.3398
1997-10-01	0.3348
1998-01-01	0.3249
1998-04-01	0.3317
1998-07-01	0.3580
1998-10-01	0.3586
1999-01-01	0.3295
1999-04-01	0.3168
1999-07-01	0.3272
1999-10-01	0.3082
2000-01-01	0.2931
2000-04-01	0.2932
2000-07-01	0.2689
2000-10-01	0.5646
2001-01-01	0.6684
2001-04-01	1.1505
2001-07-01	1.2389
2001-10-01	1.1957
2002-01-01	1.1837
2002-04-01	1.7456
2002-07-01	1.7255
2002-10-01	1.8352
2003-01-01	1.9066
2003-04-01	1.9997
2003-07-01	2.8547
2003-10-01	2.9049
2004-01-01	2.8115
2004-04-01	2.7956
2004-07-01	2.8541
2004-10-01	3.1328
2005-01-01	2.9817
2005-04-01	3.3858
2005-07-01	3.3718
2005-10-01	2.9493
2006-01-01	3.0260
2006-04-01	3.1783
2006-07-01	3.1650
2006-10-01	3.2925
2007-01-01	3.3295
2007-04-01	3.3763
2007-07-01	3.5448
2007-10-01	3.6802
2008-01-01	3.9530
2008-04-01	4.1775
2008-07-01	3.7903
2008-10-01	3.6880
2009-01-01	3.5266
2009-04-01	3.7455
2009-07-01	3.8804
2009-10-01	3.8176
2010-01-01	4.9198
2010-04-01	4.4789
2010-07-01	4.0262
2010-10-01	3.9418
2011-01-01	4.1911
2011-04-01	6.4316
2011-07-01	6.0088
2011-10-01	5.7579
2012-01-01	9.1988
2012-04-01	7.9767
2012-07-01	9.0739
2012-10-01	11.1718
2013-01-01	12.4384
2013-04-01	12.6034
2013-07-01	14.8842
2013-10-01	16.4777
2014-01-01	18.4752
2014-04-01	20.0719
2014-07-01	19.0238
2014-10-01	20.4140
2015-01-01	17.7834
2015-04-01	17.6647