Quarter	Billions of US Dollars
1987-01-01	0.1719
1987-04-01	0.1694
1987-07-01	0.1690
1987-10-01	0.2262
1988-01-01	0.3651
1988-04-01	0.3463
1988-07-01	0.3593
1988-10-01	0.3706
1989-01-01	0.3584
1989-04-01	0.4385
1989-07-01	0.6900
1989-10-01	0.7132
1990-01-01	0.7183
1990-04-01	0.8019
1990-07-01	0.8167
1990-10-01	0.8805
1991-01-01	0.8335
1991-04-01	0.8203
1991-07-01	0.8485
1991-10-01	0.8795
1992-01-01	0.8477
1992-04-01	0.8771
1992-07-01	0.9226
1992-10-01	0.8343
1993-01-01	0.6827
1993-04-01	0.6707
1993-07-01	0.6219
1993-10-01	0.6314
1994-01-01	0.6657
1994-04-01	0.6888
1994-07-01	0.5976
1994-10-01	0.6438
1995-01-01	0.6983
1995-04-01	0.7225
1995-07-01	0.7168
1995-10-01	0.6635
1996-01-01	0.6549
1996-04-01	1.0334
1996-07-01	1.0300
1996-10-01	0.8397
1997-01-01	0.7654
1997-04-01	1.3748
1997-07-01	2.2889
1997-10-01	2.3394
1998-01-01	2.3133
1998-04-01	2.3512
1998-07-01	2.5081
1998-10-01	2.3759
1999-01-01	2.2784
1999-04-01	2.5653
1999-07-01	2.6424
1999-10-01	2.8834
2000-01-01	2.8202
2000-04-01	4.0992
2000-07-01	8.0542
2000-10-01	5.2623
2001-01-01	8.8301
2001-04-01	7.6656
2001-07-01	6.9854
2001-10-01	6.8301
2002-01-01	6.8995
2002-04-01	8.0594
2002-07-01	7.1711
2002-10-01	8.1141
2003-01-01	8.9681
2003-04-01	9.2010
2003-07-01	9.4783
2003-10-01	9.4657
2004-01-01	7.9390
2004-04-01	7.1884
2004-07-01	9.4067
2004-10-01	9.8257
2005-01-01	9.3214
2005-04-01	9.3593
2005-07-01	8.5930
2005-10-01	8.0952
2006-01-01	8.9512
2006-04-01	9.3048
2006-07-01	9.2534
2006-10-01	11.9990
2007-01-01	12.2265
2007-04-01	12.2251
2007-07-01	12.4912
2007-10-01	11.6635
2008-01-01	12.0794
2008-04-01	13.8728
2008-07-01	12.7601
2008-10-01	36.6909
2009-01-01	42.2159
2009-04-01	48.7131
2009-07-01	50.0691
2009-10-01	54.2349
2010-01-01	50.4868
2010-04-01	53.4007
2010-07-01	67.8212
2010-10-01	66.0894
2011-01-01	70.3472
2011-04-01	70.3689
2011-07-01	65.7036
2011-10-01	62.9869
2012-01-01	64.7246
2012-04-01	65.1963
2012-07-01	72.9784
2012-10-01	74.3895
2013-01-01	72.7564
2013-04-01	74.9250
2013-07-01	78.2647
2013-10-01	80.1261
2014-01-01	80.0242
2014-04-01	79.4760
2014-07-01	73.2258
2014-10-01	70.6183
2015-01-01	63.2300
2015-04-01	65.6324