Quarter	Billions of US Dollars
1993-07-01	21.037
1993-10-01	22.554
1994-01-01	24.498
1994-04-01	15.375
1994-07-01	33.984
1994-10-01	32.411
1995-01-01	33.460
1995-04-01	24.014
1995-07-01	35.642
1995-10-01	40.278
1996-01-01	46.669
1996-04-01	53.144
1996-07-01	46.158
1996-10-01	62.516
1997-01-01	66.941
1997-04-01	57.553
1997-07-01	61.820
1997-10-01	22.530
1998-01-01	68.259
1998-04-01	80.417
1998-07-01	36.511
1998-10-01	17.263
1999-01-01	88.471
1999-04-01	103.615
1999-07-01	110.670
1999-10-01	45.827
2000-01-01	92.223
2000-04-01	89.091
2000-07-01	114.625
2000-10-01	119.792
2001-01-01	195.164
2001-04-01	169.426
2001-07-01	97.879
2001-10-01	136.854
2002-01-01	148.857
2002-04-01	164.901
2002-07-01	68.823
2002-10-01	95.247
2003-01-01	113.664
2003-04-01	150.681
2003-07-01	160.237
2003-10-01	167.598
2004-01-01	191.469
2004-04-01	103.092
2004-07-01	157.141
2004-10-01	148.311
2005-01-01	203.528
2005-04-01	155.844
2005-07-01	151.826
2005-10-01	183.768
2006-01-01	209.608
2006-04-01	201.879
2006-07-01	200.264
2006-10-01	266.013
2007-01-01	241.446
2007-04-01	338.808
2007-07-01	179.875
2007-10-01	176.556
2008-01-01	78.814
2008-04-01	368.528
2008-07-01	41.107
2008-10-01	33.894
2009-01-01	187.376
2009-04-01	275.535
2009-07-01	170.887
2009-10-01	208.867
2010-01-01	179.031
2010-04-01	14.993
2010-07-01	117.603
2010-10-01	86.788
2011-01-01	138.689
2011-04-01	24.518
2011-07-01	1.947
2011-10-01	-9.425
2012-01-01	207.211
2012-04-01	12.049
2012-07-01	162.842
2012-10-01	149.612
2013-01-01	-4.477
2013-04-01	38.688
2013-07-01	-14.468
2013-10-01	80.989
2014-01-01	36.646
2014-04-01	109.784
2014-07-01	62.881
2014-10-01	18.744
2015-01-01	112.722
2015-04-01	161.868