Quarter	Billions of US Dollars
1993-07-01	8.890
1993-10-01	11.806
1994-01-01	7.207
1994-04-01	5.454
1994-07-01	7.346
1994-10-01	9.761
1995-01-01	7.794
1995-04-01	8.045
1995-07-01	9.476
1995-10-01	7.043
1996-01-01	14.190
1996-04-01	10.580
1996-07-01	11.211
1996-10-01	15.809
1997-01-01	18.323
1997-04-01	14.787
1997-07-01	10.765
1997-10-01	12.285
1998-01-01	35.708
1998-04-01	14.865
1998-07-01	17.023
1998-10-01	27.825
1999-01-01	26.446
1999-04-01	17.195
1999-07-01	16.071
1999-10-01	14.438
2000-01-01	20.163
2000-04-01	19.311
2000-07-01	13.543
2000-10-01	14.342
2001-01-01	16.503
2001-04-01	22.196
2001-07-01	19.882
2001-10-01	14.255
2002-01-01	25.555
2002-04-01	18.547
2002-07-01	19.326
2002-10-01	16.709
2003-01-01	38.073
2003-04-01	26.373
2003-07-01	13.615
2003-10-01	9.790
2004-01-01	22.622
2004-04-01	24.953
2004-07-01	18.369
2004-10-01	20.682
2005-01-01	26.705
2005-04-01	26.766
2005-07-01	29.141
2005-10-01	18.534
2006-01-01	25.045
2006-04-01	24.141
2006-07-01	15.502
2006-10-01	23.577
2007-01-01	36.193
2007-04-01	29.307
2007-07-01	31.380
2007-10-01	35.831
2008-01-01	50.624
2008-04-01	45.831
2008-07-01	27.756
2008-10-01	42.043
2009-01-01	43.347
2009-04-01	82.430
2009-07-01	29.855
2009-10-01	28.605
2010-01-01	62.540
2010-04-01	48.797
2010-07-01	45.450
2010-10-01	28.340
2011-01-01	78.060
2011-04-01	65.443
2011-07-01	71.825
2011-10-01	54.344
2012-01-01	207.567
2012-04-01	63.695
2012-07-01	60.822
2012-10-01	45.835
2013-01-01	99.280
2013-04-01	87.652
2013-07-01	60.552
2013-10-01	59.619
2014-01-01	112.882
2014-04-01	88.230
2014-07-01	68.449
2014-10-01	30.764
2015-01-01	71.850
2015-04-01	62.201