Quarter	Billions of US Dollars
1993-07-01	19.298
1993-10-01	19.583
1994-01-01	21.923
1994-04-01	19.281
1994-07-01	19.428
1994-10-01	21.586
1995-01-01	21.146
1995-04-01	21.975
1995-07-01	26.152
1995-10-01	31.478
1996-01-01	33.045
1996-04-01	34.695
1996-07-01	34.248
1996-10-01	38.736
1997-01-01	36.167
1997-04-01	42.375
1997-07-01	46.514
1997-10-01	46.016
1998-01-01	52.133
1998-04-01	38.850
1998-07-01	50.248
1998-10-01	45.017
1999-01-01	52.304
1999-04-01	61.068
1999-07-01	69.864
1999-10-01	67.316
2000-01-01	87.103
2000-04-01	96.385
2000-07-01	84.126
2000-10-01	94.077
2001-01-01	83.483
2001-04-01	65.173
2001-07-01	61.788
2001-10-01	65.071
2002-01-01	59.176
2002-04-01	74.469
2002-07-01	78.189
2002-10-01	77.846
2003-01-01	87.645
2003-04-01	78.514
2003-07-01	74.925
2003-10-01	74.174
2004-01-01	112.924
2004-04-01	103.581
2004-07-01	99.927
2004-10-01	106.695
2005-01-01	116.511
2005-04-01	113.383
2005-07-01	122.344
2005-10-01	109.192
2006-01-01	118.395
2006-04-01	116.014
2006-07-01	109.659
2006-10-01	132.079
2007-01-01	146.292
2007-04-01	165.330
2007-07-01	196.864
2007-10-01	255.298
2008-01-01	284.891
2008-04-01	300.584
2008-07-01	237.866
2008-10-01	155.671
2009-01-01	175.083
2009-04-01	169.263
2009-07-01	202.368
2009-10-01	151.468
2010-01-01	190.260
2010-04-01	166.751
2010-07-01	204.689
2010-10-01	178.607
2011-01-01	183.568
2011-04-01	157.757
2011-07-01	144.520
2011-10-01	138.100
2012-01-01	258.544
2012-04-01	189.184
2012-07-01	147.062
2012-10-01	155.965
2013-01-01	194.532
2013-04-01	165.716
2013-07-01	139.785
2013-10-01	170.095
2014-01-01	170.084
2014-04-01	179.231
2014-07-01	171.586
2014-10-01	171.047
2015-01-01	191.720
2015-04-01	180.784