Quarter	Billions of US Dollars
1987-01-01	0.895
1987-04-01	0.829
1987-07-01	0.811
1987-10-01	0.883
1988-01-01	1.220
1988-04-01	1.239
1988-07-01	1.534
1988-10-01	1.739
1989-01-01	2.163
1989-04-01	2.099
1989-07-01	2.596
1989-10-01	2.797
1990-01-01	2.990
1990-04-01	3.013
1990-07-01	3.352
1990-10-01	3.774
1991-01-01	3.403
1991-04-01	3.228
1991-07-01	3.568
1991-10-01	3.879
1992-01-01	3.743
1992-04-01	3.872
1992-07-01	4.144
1992-10-01	3.864
1993-01-01	3.927
1993-04-01	3.730
1993-07-01	3.851
1993-10-01	3.681
1994-01-01	3.525
1994-04-01	3.565
1994-07-01	3.591
1994-10-01	3.674
1995-01-01	3.590
1995-04-01	3.634
1995-07-01	2.831
1995-10-01	2.472
1996-01-01	2.354
1996-04-01	2.371
1996-07-01	1.116
1996-10-01	1.007
1997-01-01	1.104
1997-04-01	1.437
1997-07-01	1.698
1997-10-01	1.928
1998-01-01	1.875
1998-04-01	1.779
1998-07-01	1.920
1998-10-01	1.902
1999-01-01	1.852
1999-04-01	1.680
1999-07-01	1.704
1999-10-01	1.791
2000-01-01	2.163
2000-04-01	2.306
2000-07-01	1.946
2000-10-01	1.842
2001-01-01	1.841
2001-04-01	2.192
2001-07-01	2.262
2001-10-01	3.035
2002-01-01	2.976
2002-04-01	3.295
2002-07-01	3.195
2002-10-01	3.331
2003-01-01	3.414
2003-04-01	4.061
2003-07-01	4.110
2003-10-01	5.505
2004-01-01	5.856
2004-04-01	5.689
2004-07-01	7.118
2004-10-01	7.899
2005-01-01	8.793
2005-04-01	9.538
2005-07-01	10.640
2005-10-01	12.620
2006-01-01	14.524
2006-04-01	15.483
2006-07-01	18.751
2006-10-01	21.557
2007-01-01	24.903
2007-04-01	29.740
2007-07-01	31.344
2007-10-01	32.386
2008-01-01	35.123
2008-04-01	36.682
2008-07-01	35.807
2008-10-01	33.921
2009-01-01	32.183
2009-04-01	32.747
2009-07-01	31.913
2009-10-01	31.972
2010-01-01	26.792
2010-04-01	23.761
2010-07-01	28.809
2010-10-01	29.941
2011-01-01	31.927
2011-04-01	34.028
2011-07-01	31.630
2011-10-01	31.922
2012-01-01	32.722
2012-04-01	35.064
2012-07-01	48.798
2012-10-01	64.424
2013-01-01	69.862
2013-04-01	75.998
2013-07-01	76.742
2013-10-01	83.451
2014-01-01	85.160
2014-04-01	92.099
2014-07-01	95.686
2014-10-01	99.827
2015-01-01	100.645
2015-04-01	101.398