Quarter	Billions of US Dollars
1987-01-01	0.069
1987-04-01	0.068
1987-07-01	0.068
1987-10-01	0.081
1988-01-01	0.080
1988-04-01	0.076
1988-07-01	0.074
1988-10-01	0.079
1989-01-01	0.076
1989-04-01	0.069
1989-07-01	0.072
1989-10-01	0.070
1990-01-01	0.064
1990-04-01	0.065
1990-07-01	0.073
1990-10-01	0.074
1991-01-01	0.071
1992-01-01	0.110
1992-04-01	0.160
1992-07-01	0.160
1992-10-01	0.160
1993-01-01	0.160
1993-04-01	0.154
1993-07-01	0.135
1993-10-01	0.376
1994-01-01	0.587
1994-04-01	0.575
1994-07-01	0.584
1994-10-01	0.621
1995-01-01	0.593
1995-04-01	0.581
1995-07-01	0.720
1995-10-01	0.865
1996-01-01	0.970
1996-04-01	1.429
1996-07-01	1.805
1996-10-01	1.812
1997-01-01	1.676
1997-04-01	2.236
1997-07-01	2.512
1997-10-01	2.534
1998-01-01	2.700
1998-04-01	3.092
1998-07-01	4.354
1998-10-01	4.006
1999-01-01	3.472
1999-04-01	3.447
1999-07-01	3.536
1999-10-01	3.912
2000-01-01	4.374
2000-04-01	4.454
2000-07-01	3.825
2000-10-01	3.763
2001-01-01	3.345
2001-04-01	4.282
2001-07-01	5.631
2001-10-01	7.130
2002-01-01	8.472
2002-04-01	9.608
2002-07-01	11.896
2002-10-01	12.021
2003-01-01	12.335
2003-04-01	13.958
2003-07-01	17.328
2003-10-01	19.068
2004-01-01	19.451
2004-04-01	19.509
2004-07-01	20.952
2004-10-01	21.648
2005-01-01	21.559
2005-04-01	20.512
2005-07-01	21.770
2005-10-01	21.755
2006-01-01	22.914
2006-04-01	23.553
2006-07-01	22.792
2006-10-01	27.888
2007-01-01	28.587
2007-04-01	30.654
2007-07-01	29.047
2007-10-01	31.696
2008-01-01	34.791
2008-04-01	38.764
2008-07-01	38.772
2008-10-01	37.768
2009-01-01	36.939
2009-04-01	36.313
2009-07-01	40.587
2009-10-01	48.680
2010-01-01	49.837
2010-04-01	52.434
2010-07-01	58.229
2010-10-01	59.546
2011-01-01	67.848
2011-04-01	70.825
2011-07-01	70.425
2011-10-01	73.642
2012-01-01	87.356
2012-04-01	89.929
2012-07-01	89.976
2012-10-01	94.777
2013-01-01	96.327
2013-04-01	111.011
2013-07-01	111.955
2013-10-01	111.891
2014-01-01	126.714
2014-04-01	135.266
2014-07-01	134.061
2014-10-01	130.846
2015-01-01	127.226
2015-04-01	128.092