Quarter	Billions of US Dollars
1993-07-01	9.513
1993-10-01	9.077
1994-01-01	9.337
1994-04-01	9.465
1994-07-01	9.477
1994-10-01	9.392
1995-01-01	9.152
1995-04-01	9.286
1995-07-01	9.174
1995-10-01	9.450
1996-01-01	9.271
1996-04-01	9.698
1996-07-01	9.139
1996-10-01	9.470
1997-01-01	8.817
1997-04-01	8.438
1997-07-01	8.201
1997-10-01	8.515
1998-01-01	7.612
1998-04-01	8.322
1998-07-01	8.693
1998-10-01	10.303
1999-01-01	9.231
1999-04-01	9.327
1999-07-01	9.627
1999-10-01	11.561
2000-01-01	11.849
2000-04-01	13.245
2000-07-01	13.582
2000-10-01	14.760
2001-01-01	16.379
2001-04-01	21.559
2001-07-01	22.681
2001-10-01	22.844
2002-01-01	24.619
2002-04-01	27.870
2002-07-01	28.231
2002-10-01	30.230
2003-01-01	30.609
2003-04-01	35.218
2003-07-01	37.547
2003-10-01	42.171
2004-01-01	44.475
2004-04-01	53.565
2004-07-01	55.514
2004-10-01	65.207
2005-01-01	64.020
2005-04-01	59.440
2005-07-01	56.120
2005-10-01	49.150
2006-01-01	50.081
2006-04-01	52.586
2006-07-01	52.076
2006-10-01	57.563
2007-01-01	55.617
2007-04-01	65.762
2007-07-01	68.365
2007-10-01	72.679
2008-01-01	76.843
2008-04-01	76.255
2008-07-01	68.936
2008-10-01	65.287
2009-01-01	67.305
2009-04-01	74.809
2009-07-01	79.846
2009-10-01	83.340
2010-01-01	86.703
2010-04-01	79.982
2010-07-01	90.662
2010-10-01	93.377
2011-01-01	101.895
2011-04-01	97.656
2011-07-01	90.002
2011-10-01	87.041
2012-01-01	93.050
2012-04-01	90.994
2012-07-01	101.060
2012-10-01	110.982
2013-01-01	110.880
2013-04-01	117.758
2013-07-01	135.235
2013-10-01	150.868
2014-01-01	153.706
2014-04-01	151.823
2014-07-01	146.042
2014-10-01	142.571
2015-01-01	130.172
2015-04-01	137.514