Quarter	Billions of US Dollars
1993-07-01	5.751
1993-10-01	4.968
1994-01-01	5.490
1994-04-01	4.746
1994-07-01	6.081
1994-10-01	6.914
1995-01-01	7.294
1995-04-01	5.846
1995-07-01	8.322
1995-10-01	8.294
1996-01-01	10.146
1996-04-01	9.774
1996-07-01	10.928
1996-10-01	8.992
1997-01-01	11.901
1997-04-01	10.893
1997-07-01	12.181
1997-10-01	13.724
1998-01-01	17.020
1998-04-01	19.297
1998-07-01	18.856
1998-10-01	17.671
1999-01-01	21.538
1999-04-01	22.689
1999-07-01	30.863
1999-10-01	24.346
2000-01-01	35.096
2000-04-01	37.739
2000-07-01	37.480
2000-10-01	33.548
2001-01-01	33.549
2001-04-01	32.071
2001-07-01	31.101
2001-10-01	32.802
2002-01-01	36.674
2002-04-01	38.704
2002-07-01	55.106
2002-10-01	46.823
2003-01-01	58.608
2003-04-01	66.477
2003-07-01	67.997
2003-10-01	73.757
2004-01-01	83.100
2004-04-01	80.670
2004-07-01	90.602
2004-10-01	94.495
2005-01-01	95.623
2005-04-01	100.840
2005-07-01	112.227
2005-10-01	101.640
2006-01-01	110.335
2006-04-01	104.477
2006-07-01	123.663
2006-10-01	137.186
2007-01-01	154.178
2007-04-01	151.676
2007-07-01	149.488
2007-10-01	143.867
2008-01-01	159.818
2008-04-01	154.839
2008-07-01	139.343
2008-10-01	152.095
2009-01-01	88.807
2009-04-01	83.269
2009-07-01	108.267
2009-10-01	77.748
2010-01-01	95.601
2010-04-01	75.395
2010-07-01	78.524
2010-10-01	61.199
2011-01-01	61.354
2011-04-01	62.091
2011-07-01	64.320
2011-10-01	61.444
2012-01-01	72.028
2012-04-01	59.246
2012-07-01	48.425
2012-10-01	33.546
2013-01-01	42.300
2013-04-01	27.378
2013-07-01	35.033
2013-10-01	34.166
2014-01-01	38.512
2014-04-01	34.575
2014-07-01	39.495
2014-10-01	37.783
2015-01-01	33.750
2015-04-01	31.126