Quarter	Billions of US Dollars
1997-01-01	4.8705
1997-04-01	4.8705
1997-07-01	4.8705
1997-10-01	4.8705
1998-01-01	4.8705
1998-04-01	4.8705
1998-07-01	4.8705
1998-10-01	4.1304
1999-01-01	4.1304
1999-04-01	4.1304
1999-07-01	4.1304
1999-10-01	4.1304
2000-01-01	4.1304
2000-04-01	4.1304
2000-07-01	4.1304
2000-10-01	4.1304
2001-01-01	4.1304
2001-04-01	4.1304
2001-07-01	4.1304
2001-10-01	4.1304
2002-01-01	4.8700
2002-04-01	4.8518
2002-07-01	4.8518
2002-10-01	4.4337
2003-01-01	5.1655
2003-04-01	5.1655
2003-07-01	5.1291
2003-10-01	4.7188
2004-01-01	4.7188
2004-04-01	5.2188
2004-07-01	5.2188
2004-10-01	6.1042
2005-01-01	6.3948
2005-04-01	6.3381
2005-07-01	7.0849
2005-10-01	7.5690
2006-01-01	7.4889
2006-04-01	7.5285
2006-07-01	7.5251
2006-10-01	7.5582
2007-01-01	8.9850
2007-04-01	8.8955
2007-07-01	9.4962
2007-10-01	9.5776
2008-01-01	8.3521
2008-04-01	8.2197
2008-07-01	8.1194
2008-10-01	8.0111
2009-01-01	8.9615
2009-04-01	9.0903
2009-07-01	10.1924
2009-10-01	10.1738
2010-01-01	10.1416
2010-04-01	10.6595
2010-07-01	10.7227
2010-10-01	13.1998
2011-01-01	13.2300
2011-04-01	13.3004
2011-07-01	13.2452
2011-10-01	13.3204
2012-01-01	14.4612
2012-04-01	14.4338
2012-07-01	14.5548
2012-10-01	14.6382
2013-01-01	14.5645
2013-04-01	14.2902
2013-07-01	14.3025
2013-10-01	14.2925
2014-01-01	14.2749
2014-04-01	14.2880
2014-07-01	14.1332
2014-10-01	16.8834
2015-01-01	17.4797
2015-04-01	17.4797