Quarter	Billions of US Dollars
1993-07-01	11.697
1993-10-01	7.816
1994-01-01	14.405
1994-04-01	7.809
1994-07-01	7.011
1994-10-01	5.492
1995-01-01	7.383
1995-04-01	6.572
1995-07-01	6.046
1995-10-01	5.381
1996-01-01	14.476
1996-04-01	15.203
1996-07-01	13.751
1996-10-01	21.798
1997-01-01	28.423
1997-04-01	16.093
1997-07-01	15.517
1997-10-01	14.465
1998-01-01	26.514
1998-04-01	20.955
1998-07-01	17.016
1998-10-01	29.857
1999-01-01	26.701
1999-04-01	34.570
1999-07-01	29.465
1999-10-01	29.231
2000-01-01	31.047
2000-04-01	28.521
2000-07-01	39.332
2000-10-01	39.916
2001-01-01	33.247
2001-04-01	31.489
2001-07-01	25.962
2001-10-01	44.269
2002-01-01	24.712
2002-04-01	31.172
2002-07-01	27.764
2002-10-01	31.131
2003-01-01	37.127
2003-04-01	37.382
2003-07-01	41.475
2003-10-01	56.835
2004-01-01	65.241
2004-04-01	55.668
2004-07-01	52.178
2004-10-01	70.138
2005-01-01	71.704
2005-04-01	61.312
2005-07-01	62.178
2005-10-01	95.239
2006-01-01	84.673
2006-04-01	77.702
2006-07-01	74.880
2006-10-01	126.229
2007-01-01	109.980
2007-04-01	116.352
2007-07-01	82.051
2007-10-01	79.848
2008-01-01	65.605
2008-04-01	198.354
2008-07-01	203.773
2008-10-01	293.757
2009-01-01	140.737
2009-04-01	94.193
2009-07-01	108.875
2009-10-01	70.418
2010-01-01	56.164
2010-04-01	48.219
2010-07-01	45.176
2010-10-01	48.225
2011-01-01	69.085
2011-04-01	80.557
2011-07-01	34.737
2011-10-01	77.479
2012-01-01	105.319
2012-04-01	64.595
2012-07-01	63.876
2012-10-01	55.832
2013-01-01	61.611
2013-04-01	62.969
2013-07-01	52.139
2013-10-01	60.267
2014-01-01	72.013
2014-04-01	80.909
2014-07-01	58.768
2014-10-01	60.393
2015-01-01	70.837
2015-04-01	58.448