Quarter	Billions of US Dollars
1997-04-01	0.05699
1997-07-01	0.05629
1997-10-01	0.05541
1998-01-01	0.05384
1998-04-01	0.05498
1998-07-01	0.05931
1998-10-01	0.05959
1999-01-01	0.05465
1999-04-01	0.05254
1999-07-01	0.05425
1999-10-01	0.05110
2000-01-01	0.04860
2000-04-01	0.04861
2000-07-01	0.04459
2000-10-01	0.04734
2001-01-01	0.08343
2001-04-01	0.08164
2001-07-01	0.08495
2001-10-01	0.08333
2002-01-01	0.08288
2002-04-01	0.03850
2002-07-01	0.03850
2002-10-01	0.14337
2003-01-01	0.14745
2003-04-01	0.15277
2003-07-01	0.15502
2003-10-01	0.16480
2004-01-01	0.48896
2004-04-01	0.48620
2004-07-01	0.49636
2004-10-01	0.54484
2005-01-01	0.51856
2005-04-01	0.48368
2005-07-01	0.48168
2005-10-01	0.47188
2006-01-01	0.48416
2006-04-01	0.50852
2006-07-01	0.69630
2006-10-01	0.72435
2007-01-01	0.73249
2007-04-01	1.08040
2007-07-01	1.13432
2007-10-01	1.17768
2008-01-01	1.26496
2008-04-01	1.26112
2008-07-01	1.14424
2008-10-01	1.11336
2009-01-01	1.06464
2009-04-01	1.13072
2009-07-01	1.17144
2009-10-01	1.15248
2010-01-01	1.07832
2010-04-01	0.98168
2010-07-01	1.09184
2010-10-01	1.06896
2011-01-01	0.71035
2011-04-01	0.72265
2011-07-01	0.67515
2011-10-01	0.64695
2012-01-01	0.66780
2012-04-01	0.62950
2012-07-01	0.64650
2012-10-01	0.52776
2013-01-01	0.51220
2013-04-01	0.52320
2013-07-01	0.74278
2013-10-01	0.75850
2014-01-01	0.75834
2014-04-01	0.75119
2014-07-01	0.69207
2014-10-01	0.66776
2015-01-01	0.59175
2015-04-01	0.61539