Quarter	Billions of US Dollars
1997-07-01	0.51784
1997-10-01	0.53087
1998-01-01	0.53931
1998-04-01	0.53373
1998-07-01	0.54426
1998-10-01	0.62548
1999-01-01	0.60592
1999-04-01	0.59216
1999-07-01	0.61908
1999-10-01	0.60777
2000-01-01	0.59976
2000-04-01	0.56859
2000-07-01	0.55276
2000-10-01	0.56107
2001-01-01	0.53599
2001-04-01	0.52794
2001-07-01	0.55279
2001-10-01	0.54535
2002-01-01	0.53512
2002-04-01	0.87118
2002-07-01	0.87783
2002-10-01	0.91435
2003-01-01	0.91428
2003-04-01	0.95639
2003-07-01	1.31558
2003-10-01	1.41495
2004-01-01	1.40973
2004-04-01	2.01206
2004-07-01	1.39721
2004-10-01	1.49932
2005-01-01	1.44935
2005-04-01	1.74691
2005-07-01	1.73617
2005-10-01	1.70399
2006-01-01	1.73449
2006-04-01	1.81203
2006-07-01	1.81560
2006-10-01	1.88274
2007-01-01	1.89487
2007-04-01	2.06231
2007-07-01	2.07611
2007-10-01	2.09864
2008-01-01	2.17727
2008-04-01	2.33097
2008-07-01	2.14454
2008-10-01	2.03761
2009-01-01	1.90855
2009-04-01	1.76201
2009-07-01	1.74064
2009-10-01	1.71226
2010-01-01	1.59729
2010-04-01	1.50146
2010-07-01	1.57558
2010-10-01	1.56456
2011-01-01	1.39877
2011-04-01	1.41128
2011-07-01	1.30354
2011-10-01	1.26214
2012-01-01	1.24600
2012-04-01	1.19681
2012-07-01	1.22142
2012-10-01	1.47717
2013-01-01	1.44325
2013-04-01	1.27264
2013-07-01	1.23581
2013-10-01	1.23797
2014-01-01	1.22354
2014-04-01	1.36453
2014-07-01	1.27954
2014-10-01	1.23579
2015-01-01	1.80521
2015-04-01	1.87488