Quarter	Billions of US Dollars
1993-07-01	25.877
1993-10-01	23.033
1994-01-01	22.961
1994-04-01	24.600
1994-07-01	23.669
1994-10-01	21.683
1995-01-01	22.894
1995-04-01	20.709
1995-07-01	18.563
1995-10-01	17.045
1996-01-01	15.611
1996-04-01	15.453
1996-07-01	15.933
1996-10-01	15.150
1997-01-01	13.716
1997-04-01	15.453
1997-07-01	14.321
1997-10-01	13.486
1998-01-01	13.870
1998-04-01	15.684
1998-07-01	21.477
1998-10-01	28.572
1999-01-01	27.601
1999-04-01	33.001
1999-07-01	38.941
1999-10-01	42.616
2000-01-01	43.273
2000-04-01	46.620
2000-07-01	46.838
2000-10-01	53.401
2001-01-01	57.055
2001-04-01	58.677
2001-07-01	66.471
2001-10-01	74.534
2002-01-01	75.356
2002-04-01	89.376
2002-07-01	88.056
2002-10-01	91.475
2003-01-01	89.931
2003-04-01	98.429
2003-07-01	98.404
2003-10-01	105.992
2004-01-01	93.424
2004-04-01	93.200
2004-07-01	91.788
2004-10-01	90.290
2005-01-01	86.224
2005-04-01	76.150
2005-07-01	73.081
2005-10-01	70.156
2006-01-01	73.911
2006-04-01	74.381
2006-07-01	72.363
2006-10-01	74.701
2007-01-01	73.421
2007-04-01	73.881
2007-07-01	81.943
2007-10-01	86.513
2008-01-01	88.934
2008-04-01	89.761
2008-07-01	70.538
2008-10-01	68.228
2009-01-01	66.014
2009-04-01	68.268
2009-07-01	70.628
2009-10-01	69.686
2010-01-01	64.184
2010-04-01	57.849
2010-07-01	60.893
2010-10-01	59.203
2011-01-01	62.329
2011-04-01	65.330
2011-07-01	58.193
2011-10-01	53.960
2012-01-01	55.562
2012-04-01	51.825
2012-07-01	49.623
2012-10-01	54.264
2013-01-01	58.440
2013-04-01	64.461
2013-07-01	69.071
2013-10-01	83.187
2014-01-01	86.588
2014-04-01	88.535
2014-07-01	83.642
2014-10-01	80.179
2015-01-01	72.401
2015-04-01	80.586