Quarter	Billions of US Dollars
1987-01-01	0.242
1987-04-01	0.175
1987-07-01	0.175
1987-10-01	0.194
1988-01-01	0.188
1988-04-01	0.179
1988-07-01	0.335
1988-10-01	0.470
1989-01-01	0.511
1989-04-01	0.682
1989-07-01	0.833
1989-10-01	1.001
1990-01-01	0.985
1990-04-01	1.258
1990-07-01	2.044
1990-10-01	2.717
1991-01-01	2.465
1991-04-01	2.519
1991-07-01	2.521
1991-10-01	2.594
1992-01-01	2.521
1992-04-01	2.425
1992-07-01	2.467
1992-10-01	2.364
1993-01-01	3.032
1993-04-01	3.184
1993-07-01	3.639
1993-10-01	3.845
1994-01-01	3.837
1994-04-01	4.099
1994-07-01	4.050
1994-10-01	4.444
1995-01-01	5.268
1995-04-01	6.106
1995-07-01	6.703
1995-10-01	8.348
1996-01-01	8.598
1996-04-01	9.051
1996-07-01	9.863
1996-10-01	11.079
1997-01-01	11.597
1997-04-01	12.738
1997-07-01	13.491
1997-10-01	15.143
1998-01-01	15.360
1998-04-01	19.251
1998-07-01	20.952
1998-10-01	24.368
1999-01-01	26.506
1999-04-01	33.539
1999-07-01	35.003
1999-10-01	37.385
2000-01-01	39.928
2000-04-01	42.150
2000-07-01	44.076
2000-10-01	45.227
2001-01-01	46.203
2001-04-01	48.183
2001-07-01	52.240
2001-10-01	55.271
2002-01-01	54.791
2002-04-01	62.879
2002-07-01	61.875
2002-10-01	66.797
2003-01-01	73.822
2003-04-01	80.084
2003-07-01	85.627
2003-10-01	106.377
2004-01-01	105.924
2004-04-01	111.589
2004-07-01	114.823
2004-10-01	138.189
2005-01-01	137.353
2005-04-01	145.779
2005-07-01	155.702
2005-10-01	172.794
2006-01-01	199.516
2006-04-01	240.535
2006-07-01	249.072
2006-10-01	281.832
2007-01-01	329.087
2007-04-01	371.363
2007-07-01	401.762
2007-10-01	438.873
2008-01-01	478.699
2008-04-01	522.120
2008-07-01	492.875
2008-10-01	526.770
2009-01-01	534.271
2009-04-01	585.294
2009-07-01	625.035
2009-10-01	630.063
2010-01-01	600.110
2010-04-01	557.606
2010-07-01	621.278
2010-10-01	607.877
2011-01-01	670.472
2011-04-01	693.962
2011-07-01	673.141
2011-10-01	656.930
2012-01-01	725.670
2012-04-01	683.847
2012-07-01	704.677
2012-10-01	740.550
2013-01-01	721.742
2013-04-01	736.695
2013-07-01	758.427
2013-10-01	777.908
2014-01-01	759.799
2014-04-01	753.016
2014-07-01	688.594
2014-10-01	657.551
2015-01-01	597.522
2015-04-01	609.476