Quarter	Billions of US Dollars
1987-01-01	4.981
1987-04-01	6.545
1987-07-01	5.074
1987-10-01	0.620
1988-01-01	5.606
1988-04-01	8.906
1988-07-01	6.471
1988-10-01	9.018
1989-01-01	7.774
1989-04-01	6.577
1989-07-01	5.998
1989-10-01	9.794
1990-01-01	5.576
1990-04-01	5.703
1990-07-01	11.728
1990-10-01	7.715
1991-01-01	5.099
1991-04-01	8.724
1991-07-01	7.503
1991-10-01	4.666
1992-01-01	5.823
1992-04-01	3.601
1992-07-01	6.058
1992-10-01	1.997
1993-01-01	6.788
1993-04-01	8.543
1993-07-01	33.686
1993-10-01	11.835
1994-01-01	15.892
1994-04-01	15.051
1994-07-01	12.260
1994-10-01	6.473
1995-01-01	14.862
1995-04-01	16.661
1995-07-01	30.275
1995-10-01	23.252
1996-01-01	37.858
1996-04-01	37.732
1996-07-01	30.654
1996-10-01	53.472
1997-01-01	46.833
1997-04-01	39.509
1997-07-01	42.841
1997-10-01	39.716
1998-01-01	56.919
1998-04-01	76.938
1998-07-01	48.295
1998-10-01	32.643
1999-01-01	88.537
1999-04-01	118.468
1999-07-01	114.062
1999-10-01	56.440
2000-01-01	79.145
2000-04-01	96.488
2000-07-01	114.139
2000-10-01	146.805
2001-01-01	170.045
2001-04-01	150.858
2001-07-01	103.324
2001-10-01	168.678
2002-01-01	132.339
2002-04-01	140.962
2002-07-01	88.501
2002-10-01	90.430
2003-01-01	98.712
2003-04-01	97.327
2003-07-01	125.872
2003-10-01	153.606
2004-01-01	110.587
2004-04-01	124.587
2004-07-01	100.809
2004-10-01	126.396
2005-01-01	84.174
2005-04-01	139.831
2005-07-01	59.949
2005-10-01	219.134
2006-01-01	152.529
2006-04-01	265.736
2006-07-01	253.989
2006-10-01	378.880
2007-01-01	306.512
2007-04-01	408.707
2007-07-01	85.326
2007-10-01	108.997
2008-01-01	49.090
2008-04-01	249.225
2008-07-01	109.464
2008-10-01	332.446
2009-01-01	281.353
2009-04-01	169.020
2009-07-01	115.582
2009-10-01	95.824
2010-01-01	8.519
2010-04-01	-29.189
2010-07-01	27.291
2010-10-01	4.203
2011-01-01	-48.110
2011-04-01	-34.817
2011-07-01	14.758
2011-10-01	106.005
2012-01-01	82.336
2012-04-01	-85.941
2012-07-01	18.645
2012-10-01	69.535
2013-01-01	-2.577
2013-04-01	9.688
2013-07-01	-3.288
2013-10-01	-7.280
2014-01-01	-35.503
2014-04-01	63.478
2014-07-01	28.055
2014-10-01	-18.232
2015-01-01	64.483
2015-04-01	83.080