Quarter	Billions of US Dollars
1987-01-01	2.5692
1987-04-01	3.0671
1987-07-01	3.6807
1987-10-01	3.9696
1988-01-01	3.8829
1988-04-01	3.9729
1988-07-01	4.6337
1988-10-01	4.2298
1989-01-01	5.0544
1989-04-01	4.5215
1989-07-01	4.9217
1989-10-01	5.0635
1990-01-01	5.6809
1990-04-01	7.2668
1990-07-01	8.4262
1990-10-01	8.6995
1991-01-01	8.6991
1991-04-01	8.2604
1991-07-01	8.1856
1991-10-01	8.7467
1992-01-01	8.1368
1992-04-01	8.1323
1992-07-01	8.0095
1992-10-01	6.9040
1993-01-01	6.5019
1993-04-01	7.1665
1993-07-01	5.2127
1993-10-01	4.8697
1994-01-01	4.5586
1994-04-01	4.5653
1994-07-01	4.8678
1994-10-01	4.4512
1995-01-01	4.5129
1995-04-01	4.4637
1995-07-01	3.8120
1995-10-01	3.7312
1996-01-01	3.4081
1996-04-01	2.7942
1996-07-01	2.2657
1996-10-01	2.1835
1997-01-01	1.9293
1997-04-01	2.0026
1997-07-01	1.9445
1997-10-01	1.8426
1998-01-01	1.6058
1998-04-01	1.5799
1998-07-01	1.6773
1998-10-01	1.4989
1999-01-01	1.3817
1999-04-01	1.3851
1999-07-01	2.2283
1999-10-01	2.1153
2000-01-01	2.8772
2000-04-01	2.7844
2000-07-01	2.8222
2000-10-01	2.8483
2001-01-01	2.7673
2001-04-01	2.6746
2001-07-01	2.8597
2001-10-01	2.4805
2002-01-01	2.1534
2002-04-01	2.0779
2002-07-01	2.2280
2002-10-01	2.3617
2003-01-01	2.8388
2003-04-01	3.3141
2003-07-01	3.8315
2003-10-01	3.4043
2004-01-01	4.8014
2004-04-01	4.9161
2004-07-01	4.2265
2004-10-01	5.2743
2005-01-01	6.9252
2005-04-01	6.4377
2005-07-01	6.0616
2005-10-01	8.1509
2006-01-01	12.4037
2006-04-01	13.0806
2006-07-01	13.5741
2006-10-01	15.4450
2007-01-01	16.8370
2007-04-01	19.2122
2007-07-01	20.4174
2007-10-01	20.3283
2008-01-01	19.5154
2008-04-01	21.2393
2008-07-01	21.0427
2008-10-01	22.9750
2009-01-01	22.1941
2009-04-01	26.2604
2009-07-01	28.0376
2009-10-01	30.5234
2010-01-01	29.0317
2010-04-01	26.5321
2010-07-01	27.8343
2010-10-01	28.6777
2011-01-01	31.0453
2011-04-01	31.8582
2011-07-01	29.6756
2011-10-01	27.6368
2012-01-01	30.7175
2012-04-01	29.8608
2012-07-01	29.3764
2012-10-01	30.0332
2013-01-01	28.9244
2013-04-01	31.4828
2013-07-01	33.6800
2013-10-01	33.2673
2014-01-01	39.1527
2014-04-01	42.6110
2014-07-01	38.2992
2014-10-01	38.9625
2015-01-01	36.3145
2015-04-01	37.9549