Quarter	Billions of US Dollars
1993-07-01	271.734
1993-10-01	265.174
1994-01-01	298.038
1994-04-01	324.252
1994-07-01	364.856
1994-10-01	378.887
1995-01-01	434.793
1995-04-01	480.738
1995-07-01	439.973
1995-10-01	435.526
1996-01-01	437.313
1996-04-01	443.807
1996-07-01	461.998
1996-10-01	461.328
1997-01-01	445.552
1997-04-01	496.646
1997-07-01	478.053
1997-10-01	443.345
1998-01-01	429.657
1998-04-01	395.319
1998-07-01	404.116
1998-10-01	461.634
1999-01-01	434.781
1999-04-01	425.876
1999-07-01	482.724
1999-10-01	496.396
2000-01-01	476.714
2000-04-01	491.286
2000-07-01	485.891
2000-10-01	450.714
2001-01-01	415.910
2001-04-01	426.141
2001-07-01	450.216
2001-10-01	409.712
2002-01-01	387.527
2002-04-01	439.628
2002-07-01	427.012
2002-10-01	429.661
2003-01-01	424.963
2003-04-01	423.983
2003-07-01	453.102
2003-10-01	482.511
2004-01-01	501.412
2004-04-01	497.650
2004-07-01	492.993
2004-10-01	523.458
2005-01-01	511.621
2005-04-01	489.868
2005-07-01	478.137
2005-10-01	463.796
2006-01-01	463.876
2006-04-01	478.747
2006-07-01	469.456
2006-10-01	478.146
2007-01-01	490.793
2007-04-01	496.253
2007-07-01	549.902
2007-10-01	568.504
2008-01-01	651.847
2008-04-01	628.326
2008-07-01	649.123
2008-10-01	735.303
2009-01-01	672.575
2009-04-01	675.698
2009-07-01	711.963
2009-10-01	681.936
2010-01-01	659.890
2010-04-01	680.168
2010-07-01	729.058
2010-10-01	748.229
2011-01-01	728.623
2011-04-01	737.571
2011-07-01	760.820
2011-10-01	742.504
2012-01-01	697.879
2012-04-01	711.524
2012-07-01	718.506
2012-10-01	646.442
2013-01-01	566.050
2013-04-01	520.154
2013-07-01	516.740
2013-10-01	485.212
2014-01-01	488.547
2014-04-01	499.216
2014-07-01	461.888
2014-10-01	417.652
2015-01-01	412.404
2015-04-01	402.149