Quarter	Billions of US Dollars
1997-07-01	0.03000
1997-10-01	0.03000
1998-01-01	0.03000
1998-04-01	0.03000
1998-07-01	0.03000
1998-10-01	0.03000
1999-01-01	0.03000
1999-04-01	0.03000
1999-07-01	0.03000
1999-10-01	0.03000
2000-01-01	0.03000
2000-04-01	0.03000
2001-04-01	0.02120
2001-07-01	0.02283
2001-10-01	0.02203
2002-01-01	0.02181
2002-04-01	0.02494
2002-07-01	0.04437
2002-10-01	0.04719
2003-01-01	0.04903
2003-04-01	0.05142
2003-07-01	0.05243
2003-10-01	0.05683
2004-01-01	0.05501
2004-04-01	0.06077
2004-07-01	0.06204
2004-10-01	0.07492
2005-01-01	0.07130
2005-04-01	0.18743
2005-07-01	0.16257
2005-10-01	0.15926
2006-01-01	0.16340
2006-04-01	0.42589
2006-07-01	0.42411
2006-10-01	0.43461
2007-01-01	0.43949
2007-04-01	0.40515
2007-07-01	0.42537
2007-10-01	0.44163
2008-01-01	0.47436
2008-04-01	0.31528
2008-07-01	0.28606
2008-10-01	0.27834
2009-01-01	0.26616
2009-04-01	0.28268
2009-07-01	0.29286
2009-10-01	0.28812
2010-01-01	0.26958
2010-04-01	0.24542
2010-07-01	0.27296
2010-10-01	0.26724
2011-01-01	0.28414
2014-07-01	0.37749
2014-10-01	0.36423
2015-01-01	0.32277
2015-04-01	0.33567