Quarter	Billions of US Dollars
1987-01-01	5.482
1987-04-01	5.735
1987-07-01	5.636
1987-10-01	6.552
1988-01-01	6.125
1988-04-01	5.870
1988-07-01	6.142
1988-10-01	6.446
1989-01-01	6.174
1989-04-01	6.069
1989-07-01	6.157
1989-10-01	6.334
1990-01-01	6.339
1990-04-01	6.193
1990-07-01	6.914
1990-10-01	7.118
1991-01-01	7.524
1991-04-01	8.530
1991-07-01	8.882
1991-10-01	9.176
1992-01-01	9.380
1992-04-01	9.915
1992-07-01	10.797
1992-10-01	10.150
1993-01-01	10.748
1993-04-01	11.380
1993-07-01	12.357
1993-10-01	12.410
1994-01-01	13.895
1994-04-01	15.415
1994-07-01	16.898
1994-10-01	17.380
1995-01-01	20.092
1995-04-01	21.940
1995-07-01	22.349
1995-10-01	24.329
1996-01-01	26.164
1996-04-01	27.785
1996-07-01	32.281
1996-10-01	36.866
1997-01-01	38.890
1997-04-01	42.277
1997-07-01	43.850
1997-10-01	42.155
1998-01-01	40.461
1998-04-01	39.369
1998-07-01	38.280
1998-10-01	38.297
1999-01-01	36.783
1999-04-01	35.760
1999-07-01	34.857
1999-10-01	35.162
2000-01-01	35.765
2000-04-01	34.726
2000-07-01	33.532
2000-10-01	31.852
2001-01-01	30.425
2001-04-01	28.838
2001-07-01	25.855
2001-10-01	25.429
2002-01-01	24.283
2002-04-01	25.026
2002-07-01	25.104
2002-10-01	25.700
2003-01-01	26.643
2003-04-01	29.306
2003-07-01	31.731
2003-10-01	33.904
2004-01-01	38.867
2004-04-01	40.216
2004-07-01	41.981
2004-10-01	45.930
2005-01-01	48.784
2005-04-01	49.696
2005-07-01	51.838
2005-10-01	54.885
2006-01-01	56.155
2006-04-01	60.266
2006-07-01	64.609
2006-10-01	66.738
2007-01-01	71.589
2007-04-01	79.114
2007-07-01	82.056
2007-10-01	86.529
2008-01-01	89.629
2008-04-01	91.647
2008-07-01	90.692
2008-10-01	83.775
2009-01-01	84.502
2009-04-01	91.049
2009-07-01	94.711
2009-10-01	92.032
2010-01-01	93.139
2010-04-01	93.910
2010-07-01	97.396
2010-10-01	102.354
2011-01-01	108.157
2011-04-01	110.769
2011-07-01	109.775
2011-10-01	113.489
2012-01-01	119.686
2012-04-01	122.082
2012-07-01	133.037
2012-10-01	128.636
2013-01-01	132.271
2013-04-01	132.463
2013-07-01	142.687
2013-10-01	148.271
2014-01-01	152.593
2014-04-01	156.297
2014-07-01	158.171
2014-10-01	184.293
2015-01-01	183.623
2015-04-01	192.287