Quarter	Billions of US Dollars
1987-01-01	0.587
1987-04-01	0.580
1987-07-01	0.580
1987-10-01	0.595
1988-01-01	0.715
1988-04-01	0.667
1988-07-01	0.611
1988-10-01	0.604
1989-01-01	0.578
1989-04-01	0.499
1989-07-01	0.589
1989-10-01	0.620
1990-01-01	0.568
1990-04-01	0.486
1990-07-01	0.483
1990-10-01	0.489
1991-01-01	0.381
1991-04-01	0.372
1991-07-01	0.366
1991-10-01	0.394
1992-01-01	0.368
1992-04-01	0.392
1992-07-01	0.418
1992-10-01	0.380
1993-01-01	0.321
1993-04-01	0.317
1993-07-01	0.377
1993-10-01	0.359
1994-01-01	0.553
1994-04-01	0.574
1994-07-01	0.828
1994-10-01	0.938
1995-01-01	1.428
1995-04-01	1.512
1995-07-01	1.752
1995-10-01	1.812
1996-01-01	2.033
1996-04-01	2.012
1996-07-01	2.138
1996-10-01	2.370
1997-01-01	2.302
1997-04-01	2.523
1997-07-01	3.065
1997-10-01	3.193
1998-01-01	3.209
1998-04-01	3.428
1998-07-01	3.625
1998-10-01	3.713
1999-01-01	3.925
1999-04-01	3.854
1999-07-01	4.429
1999-10-01	4.793
2000-01-01	5.101
2000-04-01	5.110
2000-07-01	5.903
2000-10-01	6.079
2001-01-01	6.128
2001-04-01	6.487
2001-07-01	7.268
2001-10-01	7.564
2002-01-01	7.432
2002-04-01	9.535
2002-07-01	9.823
2002-10-01	11.667
2003-01-01	12.982
2003-04-01	13.181
2003-07-01	15.860
2003-10-01	16.780
2004-01-01	19.729
2004-04-01	19.582
2004-07-01	20.315
2004-10-01	22.482
2005-01-01	23.046
2005-04-01	24.436
2005-07-01	25.126
2005-10-01	26.072
2006-01-01	30.783
2006-04-01	33.197
2006-07-01	34.299
2006-10-01	42.780
2007-01-01	47.345
2007-04-01	51.554
2007-07-01	56.192
2007-10-01	60.681
2008-01-01	56.324
2008-04-01	59.540
2008-07-01	61.000
2008-10-01	59.844
2009-01-01	57.543
2009-04-01	66.329
2009-07-01	69.193
2009-10-01	69.764
2010-01-01	68.282
2010-04-01	66.429
2010-07-01	76.988
2010-10-01	85.860
2011-01-01	91.723
2011-04-01	93.915
2011-07-01	90.757
2011-10-01	95.924
2012-01-01	97.692
2012-04-01	95.130
2012-07-01	97.877
2012-10-01	106.299
2013-01-01	110.949
2013-04-01	111.350
2013-07-01	115.006
2013-10-01	122.608
2014-01-01	122.382
2014-04-01	123.213
2014-07-01	123.558
2014-10-01	121.884
2015-01-01	128.426
2015-04-01	131.783