Quarter	Billions of US Dollars
1987-01-01	0.04900
1987-04-01	0.04900
1987-07-01	0.04900
1987-10-01	0.03900
1988-01-01	0.03900
1988-04-01	0.03900
1988-07-01	0.03500
1988-10-01	0.03500
1989-01-01	0.03500
1989-04-01	0.03500
1989-07-01	0.03500
1989-10-01	0.13452
1990-01-01	0.13363
1990-04-01	0.18403
1990-07-01	0.20837
1990-10-01	0.24344
1991-01-01	0.29636
1991-04-01	0.29344
1991-07-01	0.30755
1991-10-01	0.32607
1992-01-01	0.30537
1992-04-01	0.32430
1992-07-01	0.34560
1992-10-01	0.31921
1993-01-01	0.33008
1993-04-01	0.27916
1993-07-01	0.27684
1993-10-01	0.23670
1994-01-01	0.25134
1994-04-01	0.26082
1994-07-01	0.26512
1994-10-01	0.27167
1995-01-01	0.30186
1995-04-01	0.31101
1995-07-01	0.28519
1995-10-01	0.26152
1996-01-01	0.15947
1996-04-01	0.13474
1996-07-01	0.13363
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
1999-10-01	0.05871
2004-07-01	1.63351
2004-10-01	1.91243
2005-01-01	2.01769
2005-04-01	1.88001
2005-07-01	1.98087
2005-10-01	1.93609
2006-01-01	1.73585
2006-04-01	1.61653
2006-07-01	1.75840
2006-10-01	1.72119
2007-01-01	1.77705
2007-04-01	1.88008
2007-07-01	1.89105
2007-10-01	1.88738
2008-01-01	1.52614
2008-04-01	3.27344
2008-07-01	3.01375
2008-10-01	2.77815
2009-01-01	2.68721
2009-04-01	2.75736
2009-07-01	2.84686
2009-10-01	2.80827
2010-01-01	2.66421
2010-04-01	2.51067
2010-07-01	2.80483
2010-10-01	2.75250
2011-01-01	3.43434
2011-04-01	3.45964
2011-07-01	3.29038
2011-10-01	3.17528
2012-01-01	3.22042
2012-04-01	3.11194
2012-07-01	3.19236
2012-10-01	3.17330
2013-01-01	3.13119
2013-04-01	3.41064
2013-07-01	3.71849
2013-10-01	3.82120
2014-01-01	3.85717
2014-04-01	3.86301
2014-07-01	3.59064
2014-10-01	3.45524
2015-01-01	3.22558
2015-04-01	3.33884