Quarter	Billions of US Dollars
1987-01-01	0.02743
1987-04-01	0.02721
1987-07-01	0.02733
1987-10-01	0.03239
1988-01-01	0.03190
1988-04-01	0.03021
1988-07-01	0.02973
1988-10-01	0.03178
1989-01-01	0.03029
1989-04-01	0.02776
1989-07-01	0.02872
1989-10-01	0.02788
1990-01-01	0.02545
1990-04-01	0.02616
1990-07-01	0.02903
1990-10-01	0.02976
1991-01-01	0.02837
1991-04-01	0.02901
1991-07-01	0.03011
1991-10-01	0.03195
1992-01-01	0.03003
1992-04-01	0.03187
1992-07-01	0.03356
1992-10-01	0.03206
1993-04-01	0.07500
1993-07-01	1.36048
1993-10-01	1.73963
1994-01-01	1.78206
1994-04-01	1.74048
1994-07-01	1.73044
1994-10-01	1.68770
1995-01-01	1.70461
1995-04-01	1.80705
1995-07-01	1.95865
1995-10-01	2.06212
1996-01-01	2.32438
1996-04-01	2.56672
1996-07-01	2.74128
1996-10-01	2.62595
1997-01-01	2.81734
1997-04-01	3.27211
1997-07-01	3.38863
1997-10-01	3.05396
1998-01-01	3.09228
1998-04-01	2.97935
1998-07-01	2.99530
1998-10-01	3.05300
1999-01-01	3.00547
1999-04-01	2.98223
1999-07-01	2.73512
1999-10-01	2.84731
2000-01-01	2.82585
2000-04-01	2.71991
2000-07-01	2.65223
2000-10-01	2.55312
2001-01-01	2.49543
2001-04-01	2.46586
2001-07-01	2.35859
2001-10-01	2.26666
2002-01-01	2.27716
2002-04-01	2.10970
2002-07-01	1.80106
2002-10-01	1.79898
2003-01-01	1.80397
2003-04-01	1.61286
2003-07-01	1.65431
2003-10-01	1.46400
2004-01-01	1.46898
2004-04-01	1.43104
2004-07-01	1.41948
2004-10-01	1.45754
2005-01-01	1.45499
2005-04-01	1.40370
2005-07-01	1.40826
2005-10-01	1.38462
2006-01-01	1.42834
2006-04-01	1.35471
2006-07-01	1.36862
2006-10-01	1.40140
2007-01-01	1.16955
2007-04-01	1.18164
2007-07-01	0.93455
2007-10-01	0.95238
2008-01-01	1.01837
2008-04-01	0.95882
2008-07-01	0.91531
2008-10-01	0.89266
2009-01-01	0.87855
2009-04-01	0.91588
2009-07-01	0.92825
2009-10-01	0.93337
2010-01-01	0.96110
2010-04-01	0.95908
2010-07-01	1.02092
2010-10-01	1.02798
2011-01-01	1.02321
2011-04-01	1.00870
2011-07-01	0.99554
2011-10-01	0.97964
2012-01-01	1.00566
2012-04-01	0.97562
2012-07-01	1.00612
2012-10-01	1.99176
2013-01-01	2.08019
2013-04-01	1.96058
2013-07-01	1.94439
2013-10-01	1.86151
2014-01-01	1.88239
2014-04-01	1.88171
2014-07-01	1.88638
2014-10-01	1.85322
2015-01-01	1.87603
2015-04-01	1.83826