Quarter	Billions of US Dollars
1987-01-01	1.5853
1987-04-01	1.5737
1987-07-01	1.6973
1987-10-01	1.9576
1988-01-01	2.0483
1988-04-01	2.1028
1988-07-01	2.1839
1988-10-01	2.3937
1989-01-01	2.2938
1989-04-01	2.1298
1989-07-01	2.1942
1989-10-01	2.1492
1990-01-01	1.9939
1990-04-01	2.0410
1990-07-01	2.1915
1990-10-01	2.2426
1991-01-01	2.1408
1991-04-01	2.1771
1991-07-01	2.2548
1991-10-01	2.4015
1992-01-01	2.1221
1992-04-01	2.3568
1992-07-01	2.5443
1992-10-01	2.6802
1993-01-01	2.5588
1993-04-01	3.0713
1993-07-01	3.7734
1993-10-01	3.5874
1994-01-01	3.7204
1994-04-01	3.9700
1994-07-01	4.2690
1994-10-01	4.5634
1995-01-01	4.6036
1995-04-01	4.7874
1995-07-01	4.9160
1995-10-01	4.5607
1996-01-01	3.6788
1996-04-01	3.6119
1996-07-01	4.2071
1996-10-01	4.1360
1997-01-01	4.0753
1997-04-01	4.6841
1997-07-01	4.5844
1997-10-01	4.4029
1998-01-01	4.3768
1998-04-01	4.0613
1998-07-01	3.9949
1998-10-01	4.0764
1999-01-01	3.9346
1999-04-01	3.8116
1999-07-01	4.0628
1999-10-01	3.8588
2000-01-01	3.6989
2000-04-01	3.6768
2000-07-01	3.1631
2000-10-01	3.0861
2001-01-01	2.8330
2001-04-01	2.8346
2001-07-01	2.3144
2001-10-01	2.0189
2002-01-01	1.9813
2002-04-01	1.6659
2002-07-01	1.4696
2002-10-01	1.4778
2003-01-01	1.4766
2003-04-01	1.4781
2003-07-01	1.1406
2003-10-01	1.1605
2004-01-01	1.1751
2004-04-01	1.1542
2004-07-01	1.0154
2004-10-01	1.0416
2005-01-01	0.9357
2005-04-01	0.9270
2005-07-01	0.9195
2005-10-01	0.9072
2006-01-01	0.9086
2006-04-01	0.8175
2006-07-01	0.6915
2006-10-01	0.4906
2007-01-01	0.4927
2007-04-01	0.4848
2007-07-01	0.3101
2007-10-01	0.3117
2008-01-01	0.3249
2008-04-01	0.3193
2008-07-01	0.3200
2008-10-01	0.3342
2009-01-01	0.3246
2009-04-01	0.3042
2009-07-01	0.3114
2009-10-01	1.1873
2010-01-01	1.1862
2010-04-01	1.1964
2010-07-01	1.6145
2010-10-01	1.6297
2011-01-01	2.1634
2011-04-01	3.6414
2011-07-01	3.6814
2011-10-01	3.5367
2012-01-01	4.0110
2012-04-01	4.0067
2012-07-01	4.2653
2012-10-01	6.2421
2013-01-01	6.9583
2013-04-01	8.5356
2013-07-01	9.5461
2013-10-01	11.3820
2014-01-01	11.4936
2014-04-01	12.1283
2014-07-01	12.4934
2014-10-01	12.8148
2015-01-01	12.8444
2015-04-01	15.6352