Quarter	Billions of US Dollars
1993-07-01	21.004
1993-10-01	22.608
1994-01-01	24.453
1994-04-01	25.614
1994-07-01	26.898
1994-10-01	31.058
1995-01-01	31.483
1995-04-01	30.824
1995-07-01	35.791
1995-10-01	37.337
1996-01-01	39.203
1996-04-01	41.771
1996-07-01	44.532
1996-10-01	45.403
1997-01-01	46.468
1997-04-01	44.488
1997-07-01	44.660
1997-10-01	39.214
1998-01-01	38.816
1998-04-01	35.615
1998-07-01	32.921
1998-10-01	31.961
1999-01-01	33.212
1999-04-01	35.678
1999-07-01	35.136
1999-10-01	34.075
2000-01-01	30.668
2000-04-01	30.317
2000-07-01	26.961
2000-10-01	27.290
2001-01-01	25.260
2001-04-01	26.948
2001-07-01	27.336
2001-10-01	28.760
2002-01-01	30.841
2002-04-01	33.999
2002-07-01	35.046
2002-10-01	41.164
2003-01-01	49.944
2003-04-01	60.389
2003-07-01	64.709
2003-10-01	79.977
2004-01-01	91.560
2004-04-01	90.769
2004-07-01	97.560
2004-10-01	112.522
2005-01-01	122.479
2005-04-01	126.984
2005-07-01	131.360
2005-10-01	135.329
2006-01-01	143.327
2006-04-01	153.530
2006-07-01	159.890
2006-10-01	174.751
2007-01-01	188.998
2007-04-01	205.753
2007-07-01	213.306
2007-10-01	211.087
2008-01-01	227.103
2008-04-01	244.574
2008-07-01	199.686
2008-10-01	173.879
2009-01-01	168.892
2009-04-01	203.142
2009-07-01	220.548
2009-10-01	236.091
2010-01-01	252.696
2010-04-01	236.726
2010-07-01	273.816
2010-10-01	288.800
2011-01-01	302.071
2011-04-01	317.287
2011-07-01	294.070
2011-10-01	305.988
2012-01-01	314.407
2012-04-01	308.421
2012-07-01	326.918
2012-10-01	324.821
2013-01-01	325.022
2013-04-01	292.200
2013-07-01	295.066
2013-10-01	281.227
2014-01-01	300.506
2014-04-01	309.006
2014-07-01	296.642
2014-10-01	279.061
2015-01-01	257.189
2015-04-01	258.709