Quarter	Billions of US Dollars
1989-07-01	0.10705
1989-10-01	0.15963
1990-01-01	0.15620
1990-04-01	0.15889
1990-07-01	0.17141
1990-10-01	0.17851
1991-01-01	0.15904
1991-04-01	0.15389
1991-07-01	0.16542
1991-10-01	0.17985
1992-01-01	0.16680
1992-04-01	0.17878
1992-07-01	0.19225
1992-10-01	0.17201
1993-01-01	0.17546
1993-04-01	0.17468
1993-07-01	0.18053
1993-10-01	0.16950
1994-01-01	0.17778
1994-04-01	0.18594
1994-07-01	0.19012
1994-10-01	0.18929
1995-01-01	0.21169
1995-04-01	0.21546
1995-07-01	0.20200
1995-10-01	0.19787
1996-01-01	0.19198
1996-04-01	0.18625
1996-07-01	0.05407
1996-10-01	0.05172
1997-01-01	0.04837
1997-04-01	0.05245
1997-07-01	0.04959
1997-10-01	0.04617
1998-01-01	0.04544
1998-04-01	0.04260
1998-07-01	0.04436
1998-10-01	0.05190
1999-01-01	0.04983
1999-04-01	0.04955
1999-07-01	0.05615
2005-07-01	0.03251
2005-10-01	0.03185
2006-01-01	0.05810
2006-04-01	0.06102
2006-07-01	0.06077
2006-10-01	0.06322
2007-01-01	0.06393
2007-04-01	0.06482
2007-07-01	0.06806
2007-10-01	0.07066
2008-01-01	0.07590
2008-04-01	0.07567
2008-07-01	0.06865
2008-10-01	0.06680
2009-01-01	0.06388
2009-04-01	0.06784
2009-07-01	0.07029
2009-10-01	0.06915
2010-01-01	0.06470
2010-04-01	0.05890
2010-07-01	0.06551
2010-10-01	0.06414
2011-01-01	0.06819
2011-04-01	0.06937
2011-07-01	0.06481
2011-10-01	0.06211
2012-01-01	0.06411
2012-04-01	0.06043
2012-07-01	0.06206
2012-10-01	0.21333
2013-01-01	0.21146
2013-04-01	0.21278
2013-07-01	0.21482
2013-10-01	0.21620
2014-01-01	0.21618
2014-04-01	0.21556
2014-07-01	0.06040
2014-10-01	0.05828
2015-01-01	0.05164
2015-04-01	0.05371