Quarter	Billions of US Dollars
1993-07-01	109.696
1993-10-01	105.159
1994-01-01	108.627
1994-04-01	104.545
1994-07-01	97.499
1994-10-01	90.642
1995-01-01	85.880
1995-04-01	81.636
1995-07-01	77.250
1995-10-01	79.276
1996-01-01	82.499
1996-04-01	85.942
1996-07-01	86.788
1996-10-01	86.803
1997-01-01	88.066
1997-04-01	90.873
1997-07-01	91.357
1997-10-01	90.930
1998-01-01	90.449
1998-04-01	92.677
1998-07-01	96.404
1998-10-01	93.760
1999-01-01	92.957
1999-04-01	95.530
1999-07-01	96.974
1999-10-01	96.264
2000-01-01	94.753
2000-04-01	94.358
2000-07-01	95.256
2000-10-01	99.424
2001-01-01	101.656
2001-04-01	104.956
2001-07-01	108.755
2001-10-01	109.281
2002-01-01	110.814
2002-04-01	113.100
2002-07-01	111.803
2002-10-01	111.261
2003-01-01	112.916
2003-04-01	107.894
2003-07-01	110.369
2003-10-01	113.731
2004-01-01	115.161
2004-04-01	117.021
2004-07-01	113.934
2004-10-01	116.201
2005-01-01	115.793
2005-04-01	115.572
2005-07-01	113.079
2005-10-01	110.621
2006-01-01	114.835
2006-04-01	115.802
2006-07-01	115.553
2006-10-01	117.130
2007-01-01	118.610
2007-04-01	122.725
2007-07-01	123.671
2007-10-01	129.956
2008-01-01	128.252
2008-04-01	129.560
2008-07-01	130.518
2008-10-01	126.860
2009-01-01	125.834
2009-04-01	132.396
2009-07-01	135.720
2009-10-01	139.270
2010-01-01	144.413
2010-04-01	149.938
2010-07-01	158.476
2010-10-01	164.609
2011-01-01	170.760
2011-04-01	170.980
2011-07-01	172.011
2011-10-01	170.718
2012-01-01	174.049
2012-04-01	168.746
2012-07-01	171.678
2012-10-01	167.537
2013-01-01	174.484
2013-04-01	180.864
2013-07-01	184.328
2013-10-01	203.368
2014-01-01	212.968
2014-04-01	222.901
2014-07-01	235.100
2014-10-01	237.979
2015-01-01	240.504
2015-04-01	248.765