Quarter	Billions of US Dollars
1987-01-01	0.100
1987-04-01	0.100
1987-07-01	0.100
1987-10-01	0.100
1988-01-01	0.173
1988-04-01	0.166
1988-07-01	0.429
1988-10-01	0.447
1989-01-01	0.900
1989-04-01	0.888
1989-07-01	1.393
1989-10-01	1.525
1990-01-01	1.790
1990-04-01	1.796
1990-07-01	1.912
1990-10-01	1.991
1991-01-01	1.750
1991-04-01	1.662
1991-07-01	1.925
1991-10-01	2.087
1992-01-01	1.943
1992-04-01	2.073
1992-07-01	2.246
1992-10-01	1.989
1993-01-01	1.982
1993-04-01	1.813
1993-07-01	1.832
1993-10-01	1.727
1994-01-01	1.685
1994-04-01	1.764
1994-07-01	1.768
1994-10-01	1.765
1995-01-01	1.618
1995-04-01	1.616
1995-07-01	1.126
1995-10-01	1.149
1996-01-01	1.112
1996-04-01	1.124
1996-07-01	0.146
1996-10-01	0.145
1997-01-01	0.170
1997-04-01	0.275
1997-07-01	0.426
1997-10-01	0.588
1998-01-01	0.472
1998-04-01	0.386
1998-07-01	0.286
1998-10-01	0.223
1999-01-01	0.217
1999-04-01	0.212
1999-07-01	0.201
1999-10-01	0.201
2000-01-01	0.201
2000-04-01	0.201
2000-07-01	0.001
2000-10-01	0.001
2001-01-01	0.001
2001-04-01	0.101
2001-07-01	0.101
2001-10-01	0.101
2002-01-01	0.101
2002-04-01	0.101
2002-07-01	0.101
2002-10-01	0.226
2003-01-01	0.226
2003-04-01	0.701
2003-07-01	0.701
2003-10-01	2.051
2004-01-01	2.426
2004-04-01	2.801
2004-07-01	3.651
2004-10-01	4.801
2005-01-01	6.016
2005-04-01	8.009
2005-07-01	8.858
2005-10-01	10.332
2006-01-01	12.064
2006-04-01	14.488
2006-07-01	15.524
2006-10-01	20.494
2007-01-01	24.536
2007-04-01	31.149
2007-07-01	30.494
2007-10-01	35.232
2008-01-01	35.825
2008-04-01	42.865
2008-07-01	41.567
2008-10-01	39.924
2009-01-01	37.113
2009-04-01	38.115
2009-07-01	37.253
2009-10-01	34.809
2010-01-01	35.481
2010-04-01	32.523
2010-07-01	43.116
2010-10-01	51.731
2011-01-01	54.560
2011-04-01	58.341
2011-07-01	56.330
2011-10-01	55.494
2012-01-01	61.859
2012-04-01	67.864
2012-07-01	90.957
2012-10-01	100.231
2013-01-01	105.931
2013-04-01	103.883
2013-07-01	104.476
2013-10-01	109.112
2014-01-01	111.872
2014-04-01	110.314
2014-07-01	110.103
2014-10-01	107.533
2015-01-01	103.668
2015-04-01	103.652