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	0.05886
1990-04-01	0.06143
1990-07-01	0.06752
1990-10-01	0.06836
1991-01-01	0.06262
1991-04-01	0.06106
1991-07-01	0.06460
1991-10-01	0.08728
1992-01-01	0.08008
1992-04-01	0.08632
1992-07-01	0.09456
1992-10-01	0.11792
1993-01-01	0.08361
1993-04-01	0.20418
1993-07-01	1.54604
1993-10-01	2.02943
1994-01-01	2.36205
1994-04-01	2.27037
1994-07-01	2.27724
1994-10-01	2.22694
1995-01-01	2.30155
1995-04-01	2.39945
1995-07-01	2.55379
1995-10-01	2.61204
1996-01-01	2.86123
1996-04-01	3.08500
1996-07-01	3.39302
1996-10-01	3.25384
1997-01-01	3.40642
1997-04-01	3.84384
1997-07-01	3.96050
1997-10-01	3.62395
1998-01-01	3.65085
1998-04-01	3.53732
1998-07-01	3.53141
1998-10-01	3.59155
1999-01-01	3.52232
1999-04-01	3.48783
1999-07-01	3.24990
1999-10-01	3.34528
2000-01-01	3.31343
2000-04-01	3.21366
2000-07-01	3.13026
2000-10-01	2.93276
2001-01-01	2.63064
2001-04-01	2.60107
2001-07-01	2.35880
2001-10-01	2.26687
2002-01-01	2.27737
2002-04-01	2.10991
2002-07-01	1.80127
2002-10-01	1.79919
2003-01-01	1.80418
2003-04-01	1.61307
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	1.52092
2010-10-01	1.52798
2011-01-01	1.52321
2011-04-01	2.20870
2011-07-01	2.19574
2011-10-01	2.17983
2012-01-01	2.20585
2012-04-01	2.67581
2012-07-01	2.70631
2012-10-01	3.99193
2013-01-01	4.08035
2013-04-01	3.96073
2013-07-01	3.94455
2013-10-01	3.86165
2014-01-01	3.88253
2014-04-01	4.18186
2014-07-01	4.18652
2014-10-01	4.15335
2015-01-01	4.17615
2015-04-01	4.13838