Quarter	Billions of US Dollars
1990-04-01	0.00200
1990-07-01	0.03900
1990-10-01	0.23600
1991-01-01	0.07900
1991-04-01	0.00900
1991-07-01	0.03400
1991-10-01	0.03200
1992-01-01	0.04200
1992-04-01	0.02000
1992-07-01	0.01900
1992-10-01	0.00800
1993-01-01	0.00800
1993-04-01	0.13800
1993-07-01	0.19587
1993-10-01	0.32251
1994-01-01	0.37609
1994-04-01	0.82107
1994-07-01	0.87997
1994-10-01	0.49816
1995-01-01	0.16711
1995-04-01	0.23416
1995-07-01	0.14366
1995-10-01	0.22561
1996-01-01	0.35100
1996-04-01	0.32562
1996-07-01	0.16309
1996-10-01	0.07783
1997-01-01	0.16071
1997-04-01	0.06613
1997-07-01	0.34721
1997-10-01	0.31103
1998-01-01	0.37844
1998-04-01	0.23044
1998-07-01	0.05611
1998-10-01	0.02078
1999-01-01	0.03743
1999-04-01	0.11901
1999-07-01	0.13760
1999-10-01	0.22319
2000-01-01	0.21866
2000-04-01	0.24023
2000-07-01	0.32708
2000-10-01	0.38869
2001-01-01	0.33034
2001-04-01	0.29033
2001-07-01	0.21006
2001-10-01	0.27568
2002-01-01	0.24237
2002-04-01	0.29666
2002-07-01	0.69200
2002-10-01	0.73836
2003-01-01	0.79197
2003-04-01	0.72066
2003-07-01	0.83647
2003-10-01	0.81558
2004-01-01	1.37552
2004-04-01	1.61523
2004-07-01	2.07698
2004-10-01	2.31101
2005-01-01	1.92632
2005-04-01	1.81832
2005-07-01	1.87092
2005-10-01	2.16578
2006-01-01	3.19230
2006-04-01	3.62558
2006-07-01	2.64044
2006-10-01	2.19568
2007-01-01	1.86933
2007-04-01	1.96439
2007-07-01	2.37629
2007-10-01	3.27530
2008-01-01	4.85088
2008-04-01	4.84644
2008-07-01	6.24863
2008-10-01	3.43709
2009-01-01	2.80890
2009-04-01	2.38850
2009-07-01	3.00489
2009-10-01	1.72852
2010-01-01	2.89513
2010-04-01	2.81126
2010-07-01	2.54609
2010-10-01	2.52545
2011-01-01	1.83056
2011-04-01	2.04304
2011-07-01	3.75459
2011-10-01	2.03210
2012-01-01	4.12817
2012-04-01	6.34842
2012-07-01	7.27985
2012-10-01	3.74103
2013-01-01	3.36506
2013-04-01	3.73908
2013-07-01	4.58015
2013-10-01	5.21051
2014-01-01	5.68333
2014-04-01	4.30672
2014-07-01	3.77478
2014-10-01	2.08196
2015-01-01	1.19542
2015-04-01	1.60204