Quarter	Billions of US Dollars
1987-01-01	0.051
1987-04-01	0.591
1987-07-01	0.268
1987-10-01	0.667
1988-01-01	0.571
1988-04-01	1.798
1988-07-01	1.962
1988-10-01	1.358
1989-01-01	1.278
1989-04-01	0.794
1989-07-01	1.579
1989-10-01	2.151
1990-01-01	1.762
1990-04-01	1.316
1990-07-01	3.687
1990-10-01	3.013
1991-01-01	2.316
1991-04-01	4.025
1991-07-01	3.508
1991-10-01	1.564
1992-01-01	2.187
1992-04-01	1.520
1992-07-01	0.230
1992-10-01	0.684
1993-01-01	1.121
1993-04-01	3.174
1993-07-01	6.324
1993-10-01	6.475
1994-01-01	2.579
1994-04-01	3.698
1994-07-01	5.993
1994-10-01	0.110
1995-01-01	2.015
1995-04-01	2.761
1995-07-01	2.444
1995-10-01	3.923
1996-01-01	2.225
1996-04-01	3.258
1996-07-01	-1.100
1996-10-01	8.984
1997-01-01	5.806
1997-04-01	2.254
1997-07-01	5.207
1997-10-01	5.216
1998-01-01	8.244
1998-04-01	9.506
1998-07-01	2.462
1998-10-01	0.550
1999-01-01	23.376
1999-04-01	23.150
1999-07-01	14.457
1999-10-01	2.389
2000-01-01	12.555
2000-04-01	15.869
2000-07-01	7.465
2000-10-01	10.796
2001-01-01	10.142
2001-04-01	12.322
2001-07-01	10.064
2001-10-01	19.819
2002-01-01	9.509
2002-04-01	20.673
2002-07-01	16.958
2002-10-01	15.424
2003-01-01	25.526
2003-04-01	29.246
2003-07-01	29.136
2003-10-01	36.501
2004-01-01	34.308
2004-04-01	30.743
2004-07-01	35.880
2004-10-01	32.019
2005-01-01	37.157
2005-04-01	30.353
2005-07-01	33.306
2005-10-01	54.790
2006-01-01	33.758
2006-04-01	45.094
2006-07-01	56.737
2006-10-01	77.174
2007-01-01	79.753
2007-04-01	75.885
2007-07-01	-2.353
2007-10-01	8.054
2008-01-01	0.305
2008-04-01	56.554
2008-07-01	59.928
2008-10-01	118.206
2009-01-01	22.246
2009-04-01	2.712
2009-07-01	20.037
2009-10-01	4.264
2010-01-01	-11.628
2010-04-01	-25.857
2010-07-01	-8.699
2010-10-01	-23.164
2011-01-01	-2.018
2011-04-01	5.944
2011-07-01	-14.214
2011-10-01	33.105
2012-01-01	11.743
2012-04-01	-30.142
2012-07-01	10.555
2012-10-01	11.890
2013-01-01	-5.596
2013-04-01	8.632
2013-07-01	-1.042
2013-10-01	8.900
2014-01-01	-7.234
2014-04-01	4.765
2014-07-01	11.401
2014-10-01	7.526
2015-01-01	20.600
2015-04-01	3.361