Quarter	Billions of US Dollars
1993-07-01	27.345
1993-10-01	27.710
1994-01-01	31.801
1994-04-01	33.115
1994-07-01	40.698
1994-10-01	39.605
1995-01-01	42.818
1995-04-01	44.101
1995-07-01	45.435
1995-10-01	46.397
1996-01-01	47.008
1996-04-01	44.278
1996-07-01	51.172
1996-10-01	51.732
1997-01-01	48.995
1997-04-01	51.558
1997-07-01	44.574
1997-10-01	46.696
1998-01-01	47.407
1998-04-01	47.710
1998-07-01	47.429
1998-10-01	48.272
1999-01-01	45.548
1999-04-01	47.184
1999-07-01	41.912
1999-10-01	41.832
2000-01-01	39.901
2000-04-01	42.412
2000-07-01	39.985
2000-10-01	40.054
2001-01-01	38.125
2001-04-01	36.872
2001-07-01	38.300
2001-10-01	35.713
2002-01-01	36.268
2002-04-01	34.029
2002-07-01	33.669
2002-10-01	35.277
2003-01-01	38.099
2003-04-01	40.333
2003-07-01	44.183
2003-10-01	48.736
2004-01-01	49.806
2004-04-01	52.261
2004-07-01	53.821
2004-10-01	61.109
2005-01-01	55.684
2005-04-01	53.236
2005-07-01	52.635
2005-10-01	51.462
2006-01-01	57.064
2006-04-01	59.892
2006-07-01	63.433
2006-10-01	69.482
2007-01-01	68.768
2007-04-01	69.340
2007-07-01	72.144
2007-10-01	73.169
2008-01-01	75.173
2008-04-01	74.116
2008-07-01	67.636
2008-10-01	66.907
2009-01-01	64.103
2009-04-01	67.798
2009-07-01	72.211
2009-10-01	72.093
2010-01-01	72.082
2010-04-01	73.253
2010-07-01	87.826
2010-10-01	93.838
2011-01-01	100.512
2011-04-01	104.220
2011-07-01	100.765
2011-10-01	97.601
2012-01-01	101.578
2012-04-01	95.091
2012-07-01	94.139
2012-10-01	93.184
2013-01-01	89.324
2013-04-01	89.583
2013-07-01	90.379
2013-10-01	91.186
2014-01-01	90.954
2014-04-01	92.779
2014-07-01	86.355
2014-10-01	84.317
2015-01-01	70.860
2015-04-01	71.929