Quarter	Billions of US Dollars
1987-01-01	1.483
1987-04-01	1.459
1987-07-01	1.534
1987-10-01	1.804
1988-01-01	1.751
1988-04-01	1.601
1988-07-01	1.717
1988-10-01	1.954
1989-01-01	1.817
1989-04-01	1.950
1989-07-01	2.011
1989-10-01	2.689
1990-01-01	2.739
1990-04-01	2.903
1990-07-01	3.334
1990-10-01	3.584
1991-01-01	3.509
1991-04-01	3.439
1991-07-01	3.857
1991-10-01	4.214
1992-01-01	4.018
1992-04-01	4.390
1992-07-01	4.665
1992-10-01	4.226
1993-01-01	4.256
1993-04-01	4.131
1993-07-01	4.732
1993-10-01	4.448
1994-01-01	4.381
1994-04-01	4.756
1994-07-01	4.912
1994-10-01	5.097
1995-01-01	6.427
1995-04-01	6.972
1995-07-01	7.283
1995-10-01	7.977
1996-01-01	7.728
1996-04-01	7.749
1996-07-01	8.882
1996-10-01	9.069
1997-01-01	8.693
1997-04-01	9.181
1997-07-01	9.435
1997-10-01	9.656
1998-01-01	9.586
1998-04-01	13.636
1998-07-01	14.466
1998-10-01	15.075
1999-01-01	15.015
1999-04-01	16.315
1999-07-01	20.590
1999-10-01	21.190
2000-01-01	20.517
2000-04-01	21.918
2000-07-01	20.913
2000-10-01	24.367
2001-01-01	29.150
2001-04-01	28.943
2001-07-01	34.519
2001-10-01	39.728
2002-01-01	43.723
2002-04-01	52.707
2002-07-01	53.145
2002-10-01	58.713
2003-01-01	66.159
2003-04-01	72.659
2003-07-01	77.300
2003-10-01	95.925
2004-01-01	99.991
2004-04-01	107.824
2004-07-01	109.523
2004-10-01	123.338
2005-01-01	126.173
2005-04-01	134.413
2005-07-01	148.818
2005-10-01	159.173
2006-01-01	163.254
2006-04-01	180.290
2006-07-01	198.106
2006-10-01	216.094
2007-01-01	222.767
2007-04-01	229.300
2007-07-01	246.158
2007-10-01	263.138
2008-01-01	280.223
2008-04-01	289.337
2008-07-01	265.595
2008-10-01	257.289
2009-01-01	243.196
2009-04-01	258.069
2009-07-01	286.140
2009-10-01	293.191
2010-01-01	281.381
2010-04-01	263.958
2010-07-01	274.447
2010-10-01	274.232
2011-01-01	286.420
2011-04-01	295.313
2011-07-01	284.884
2011-10-01	276.738
2012-01-01	291.399
2012-04-01	281.274
2012-07-01	291.156
2012-10-01	295.688
2013-01-01	301.923
2013-04-01	325.868
2013-07-01	337.027
2013-10-01	350.489
2014-01-01	363.880
2014-04-01	373.475
2014-07-01	353.997
2014-10-01	344.815
2015-01-01	347.383
2015-04-01	366.048