Quarter	Billions of US Dollars
1993-07-01	0.20459
1993-10-01	0.19601
1994-01-01	0.20567
1994-04-01	0.21569
1994-07-01	0.22551
1994-10-01	0.22112
1995-01-01	0.25459
1995-04-01	0.25195
1995-07-01	0.25354
1995-10-01	0.21295
1996-01-01	0.20585
1996-04-01	0.19577
1996-07-01	0.07956
1996-10-01	0.07427
1997-01-01	0.06891
1997-04-01	0.06855
1997-07-01	0.06887
2008-04-01	0.29478
2008-07-01	0.27231
2008-10-01	0.28203
2009-01-01	0.26353
2009-04-01	0.55540
2009-07-01	0.58309
2009-10-01	0.58224
2010-01-01	0.56593
2010-04-01	0.55494
2010-07-01	0.61665
2010-10-01	0.63857
2011-01-01	0.65588
2011-04-01	0.71908
2011-07-01	0.66563
2011-10-01	0.63769
2012-01-01	0.66438
2012-04-01	0.31400
2012-07-01	0.32068
2012-10-01	0.32730
2013-01-01	0.31509
2013-04-01	0.31874
2013-07-01	0.33142
2013-10-01	0.56085
2014-01-01	0.56561
2014-04-01	0.22464
2014-07-01	0.20875
2014-10-01	0.20220
2015-01-01	0.20559
2015-04-01	0.21492