Quarter	Billions of US Dollars
1987-01-01	0.368
1987-04-01	0.515
1987-07-01	0.514
1987-10-01	0.555
1988-01-01	0.540
1988-04-01	0.517
1988-07-01	0.507
1988-10-01	0.520
1989-01-01	0.502
1989-04-01	0.498
1989-07-01	0.507
1989-10-01	0.444
1990-01-01	0.448
1990-04-01	0.455
1990-07-01	0.475
1990-10-01	0.483
1991-01-01	0.482
1991-04-01	0.593
1991-07-01	0.769
1991-10-01	0.792
1992-01-01	0.768
1992-04-01	0.790
1992-07-01	0.817
1992-10-01	0.774
1993-01-01	0.772
1993-04-01	0.914
1993-07-01	2.326
1993-10-01	4.322
1994-01-01	6.083
1994-04-01	6.708
1994-07-01	7.817
1994-10-01	9.851
1995-01-01	9.552
1995-04-01	9.462
1995-07-01	9.731
1995-10-01	10.449
1996-01-01	11.098
1996-04-01	12.834
1996-07-01	14.121
1996-10-01	16.853
1997-01-01	19.435
1997-04-01	22.882
1997-07-01	26.016
1997-10-01	25.764
1998-01-01	25.977
1998-04-01	28.807
1998-07-01	30.369
1998-10-01	30.688
1999-01-01	36.584
1999-04-01	36.833
1999-07-01	37.872
1999-10-01	39.335
2000-01-01	39.758
2000-04-01	41.639
2000-07-01	45.908
2000-10-01	48.313
2001-01-01	55.987
2001-04-01	59.651
2001-07-01	62.582
2001-10-01	62.423
2002-01-01	62.332
2002-04-01	63.768
2002-07-01	62.959
2002-10-01	66.419
2003-01-01	66.864
2003-04-01	69.293
2003-07-01	71.530
2003-10-01	80.120
2004-01-01	78.902
2004-04-01	81.412
2004-07-01	82.961
2004-10-01	90.703
2005-01-01	94.898
2005-04-01	101.954
2005-07-01	106.521
2005-10-01	109.407
2006-01-01	113.629
2006-04-01	121.342
2006-07-01	125.380
2006-10-01	134.877
2007-01-01	144.476
2007-04-01	152.045
2007-07-01	154.572
2007-10-01	156.706
2008-01-01	165.213
2008-04-01	166.457
2008-07-01	162.298
2008-10-01	156.223
2009-01-01	140.207
2009-04-01	152.975
2009-07-01	161.203
2009-10-01	164.586
2010-01-01	164.893
2010-04-01	157.208
2010-07-01	165.682
2010-10-01	163.972
2011-01-01	157.927
2011-04-01	160.743
2011-07-01	158.365
2011-10-01	157.564
2012-01-01	170.204
2012-04-01	175.825
2012-07-01	186.322
2012-10-01	199.415
2013-01-01	204.073
2013-04-01	204.034
2013-07-01	203.283
2013-10-01	201.158
2014-01-01	204.310
2014-04-01	202.672
2014-07-01	204.447
2014-10-01	204.852
2015-01-01	208.274
2015-04-01	213.571