Quarter	Billions of US Dollars
1997-01-01	0.3501
1997-04-01	0.3486
1997-07-01	1.9802
1997-10-01	1.9772
1998-01-01	2.0666
1998-04-01	2.0715
1998-07-01	2.0953
1998-10-01	2.0467
1999-01-01	2.3461
1999-04-01	2.3236
1999-07-01	2.3419
1999-10-01	2.5529
2000-01-01	2.9953
2000-04-01	2.9966
2000-07-01	3.2796
2000-10-01	3.2990
2001-01-01	3.7682
2001-04-01	3.7202
2001-07-01	4.0720
2001-10-01	3.9463
2002-01-01	4.0601
2002-04-01	4.6228
2002-07-01	4.5809
2002-10-01	4.7321
2003-01-01	5.3647
2003-04-01	5.7195
2003-07-01	5.8712
2003-10-01	6.1838
2004-01-01	6.1091
2004-04-01	6.6477
2004-07-01	6.5082
2004-10-01	6.7211
2005-01-01	5.8393
2005-04-01	5.5874
2005-07-01	5.5493
2005-10-01	5.4453
2006-01-01	4.9522
2006-04-01	5.1056
2006-07-01	4.4703
2006-10-01	4.5777
2007-01-01	4.6193
2007-04-01	4.6268
2007-07-01	4.4827
2007-10-01	4.6086
2008-01-01	4.2552
2008-04-01	3.9798
2008-07-01	3.6138
2008-10-01	3.5628
2009-01-01	2.7007
2009-04-01	3.6505
2009-07-01	3.7387
2009-10-01	5.1795
2010-01-01	4.2348
2010-04-01	3.9932
2010-07-01	5.4796
2010-10-01	5.4224
2011-01-01	6.0259
2011-04-01	6.0566
2011-07-01	6.9506
2011-10-01	6.8378
2012-01-01	6.9212
2012-04-01	8.2680
2012-07-01	8.3360
2012-10-01	8.3888
2013-01-01	8.3110
2013-04-01	9.8660
2013-07-01	9.9510
2013-10-01	11.7582
2014-01-01	11.7576
2014-04-01	12.7559
2014-07-01	12.4603
2014-10-01	12.3388
2015-01-01	12.7657
2015-04-01	12.9161