Quarter	Billions of US Dollars
1987-01-01	1.585
1987-04-01	1.574
1987-07-01	1.697
1987-10-01	1.958
1988-01-01	2.048
1988-04-01	2.103
1988-07-01	2.184
1988-10-01	2.394
1989-01-01	2.294
1989-04-01	2.130
1989-07-01	2.194
1989-10-01	2.149
1990-01-01	1.994
1990-04-01	2.041
1990-07-01	2.192
1990-10-01	2.243
1991-01-01	2.141
1991-04-01	2.177
1991-07-01	2.255
1991-10-01	2.402
1992-01-01	2.122
1992-04-01	2.357
1992-07-01	2.544
1992-10-01	2.840
1993-01-01	2.731
1993-04-01	3.259
1993-07-01	4.464
1993-10-01	4.610
1994-01-01	4.823
1994-04-01	5.080
1994-07-01	5.380
1994-10-01	5.883
1995-01-01	5.946
1995-04-01	6.142
1995-07-01	6.263
1995-10-01	5.730
1996-01-01	4.813
1996-04-01	4.695
1996-07-01	5.367
1996-10-01	5.705
1997-01-01	5.613
1997-04-01	7.283
1997-07-01	7.559
1997-10-01	7.151
1998-01-01	7.555
1998-04-01	7.514
1998-07-01	7.389
1998-10-01	7.421
1999-01-01	7.272
1999-04-01	7.168
1999-07-01	7.656
1999-10-01	7.311
2000-01-01	7.144
2000-04-01	7.163
2000-07-01	6.587
2000-10-01	6.760
2001-01-01	6.496
2001-04-01	7.106
2001-07-01	6.453
2001-10-01	6.152
2002-01-01	6.772
2002-04-01	7.341
2002-07-01	6.991
2002-10-01	6.981
2003-01-01	6.383
2003-04-01	6.470
2003-07-01	6.531
2003-10-01	7.575
2004-01-01	7.480
2004-04-01	7.368
2004-07-01	7.629
2004-10-01	8.319
2005-01-01	8.673
2005-04-01	8.760
2005-07-01	9.202
2005-10-01	9.454
2006-01-01	9.755
2006-04-01	10.926
2006-07-01	11.352
2006-10-01	12.467
2007-01-01	12.747
2007-04-01	15.873
2007-07-01	16.864
2007-10-01	17.776
2008-01-01	17.493
2008-04-01	19.556
2008-07-01	19.867
2008-10-01	19.609
2009-01-01	20.012
2009-04-01	20.718
2009-07-01	21.331
2009-10-01	22.840
2010-01-01	24.130
2010-04-01	26.796
2010-07-01	35.217
2010-10-01	41.302
2011-01-01	50.256
2011-04-01	62.692
2011-07-01	64.333
2011-10-01	65.938
2012-01-01	68.974
2012-04-01	78.375
2012-07-01	81.846
2012-10-01	92.682
2013-01-01	103.148
2013-04-01	121.965
2013-07-01	128.183
2013-10-01	148.592
2014-01-01	160.356
2014-04-01	190.127
2014-07-01	201.219
2014-10-01	227.820
2015-01-01	243.719
2015-04-01	276.719