Quarter	Billions of US Dollars
1998-01-01	0.0124
1998-04-01	0.0113
1998-07-01	0.0108
1998-10-01	0.0095
2005-01-01	2.4017
2005-04-01	3.6184
2005-07-01	4.0150
2005-10-01	5.6958
2006-01-01	7.2751
2006-04-01	6.8328
2006-07-01	7.8304
2006-10-01	9.4805
2007-01-01	12.1197
2007-04-01	14.1387
2007-07-01	15.5922
2007-10-01	16.7514
2008-01-01	15.2741
2008-04-01	18.0208
2008-07-01	18.0488
2008-10-01	14.5820
2009-01-01	13.5217
2009-04-01	14.8698
2009-07-01	16.2015
2009-10-01	16.2528
2010-01-01	16.4001
2010-04-01	16.6365
2010-07-01	17.9733
2010-10-01	19.4032
2011-01-01	19.3608
2011-04-01	20.0204
2011-07-01	18.8081
2011-10-01	19.9275
2012-01-01	23.6627
2012-04-01	25.9794
2012-07-01	28.9983
2012-10-01	30.9043
2013-01-01	33.0004
2013-04-01	32.3754
2013-07-01	30.7849
2013-10-01	29.8277
2014-01-01	29.2153
2014-04-01	32.3880
2014-07-01	31.2109
2014-10-01	31.3801
2015-01-01	26.8293
2015-04-01	27.0242