Quarter	Billions of US Dollars
1998-04-01	0.0004
1998-07-01	0.0002
1998-10-01	0.1293
1999-01-01	0.1104
1999-04-01	0.1090
1999-07-01	0.2389
1999-10-01	0.2253
2000-01-01	0.2137
2000-04-01	0.2097
2000-07-01	0.2207
2000-10-01	0.4929
2001-01-01	0.4831
2001-04-01	0.4652
2001-07-01	0.4119
2001-10-01	0.3905
2002-01-01	0.3677
2002-04-01	0.3256
2002-07-01	0.3144
2002-10-01	0.3051
2003-01-01	0.2880
2003-04-01	0.2797
2003-07-01	0.2675
2003-10-01	0.2696
2004-01-01	0.2910
2004-04-01	0.2856
2004-07-01	0.2837
2004-10-01	0.2988
2005-01-01	0.4021
2005-04-01	0.5926
2005-07-01	0.6012
2005-10-01	0.5699
2006-01-01	1.1283
2006-04-01	1.7988
2006-07-01	2.4756
2006-10-01	3.3091
2007-01-01	4.5604
2007-04-01	5.7762
2007-07-01	7.5938
2007-10-01	9.3531
2008-01-01	10.9057
2008-04-01	12.4791
2008-07-01	11.5703
2008-10-01	10.7352
2009-01-01	9.3594
2009-04-01	10.8627
2009-07-01	11.5461
2009-10-01	11.9195
2010-01-01	12.8153
2010-04-01	11.4125
2010-07-01	12.1037
2010-10-01	14.0364
2011-01-01	17.8251
2011-04-01	18.7228
2011-07-01	17.2130
2011-10-01	19.5569
2012-01-01	24.0689
2012-04-01	21.8670
2012-07-01	28.8560
2012-10-01	33.2764
2013-01-01	34.4874
2013-04-01	33.1159
2013-07-01	34.0935
2013-10-01	33.9426
2014-01-01	30.4198
2014-04-01	33.5984
2014-07-01	28.3504
2014-10-01	19.7993
2015-01-01	19.5293
2015-04-01	20.6374