Quarter	Billions of US Dollars
1993-07-01	23.502
1993-10-01	30.638
1994-01-01	29.676
1994-04-01	20.529
1994-07-01	18.329
1994-10-01	23.577
1995-01-01	31.961
1995-04-01	29.258
1995-07-01	26.774
1995-10-01	27.539
1996-01-01	50.823
1996-04-01	45.125
1996-07-01	45.940
1996-10-01	43.613
1997-01-01	46.755
1997-04-01	29.691
1997-07-01	38.210
1997-10-01	31.522
1998-01-01	71.609
1998-04-01	58.820
1998-07-01	44.317
1998-10-01	39.797
1999-01-01	91.710
1999-04-01	77.609
1999-07-01	81.876
1999-10-01	62.971
2000-01-01	87.969
2000-04-01	67.195
2000-07-01	64.286
2000-10-01	61.504
2001-01-01	140.530
2001-04-01	119.403
2001-07-01	54.789
2001-10-01	92.291
2002-01-01	114.160
2002-04-01	99.727
2002-07-01	64.243
2002-10-01	73.054
2003-01-01	170.230
2003-04-01	190.215
2003-07-01	108.565
2003-10-01	116.404
2004-01-01	212.945
2004-04-01	135.706
2004-07-01	132.648
2004-10-01	148.499
2005-01-01	217.836
2005-04-01	193.732
2005-07-01	137.961
2005-10-01	157.490
2006-01-01	258.296
2006-04-01	206.860
2006-07-01	185.849
2006-10-01	241.319
2007-01-01	272.193
2007-04-01	279.672
2007-07-01	165.165
2007-10-01	222.359
2008-01-01	223.394
2008-04-01	407.883
2008-07-01	173.220
2008-10-01	182.164
2009-01-01	360.839
2009-04-01	476.185
2009-07-01	286.077
2009-10-01	256.423
2010-01-01	359.758
2010-04-01	183.714
2010-07-01	218.114
2010-10-01	178.131
2011-01-01	328.493
2011-04-01	273.814
2011-07-01	160.799
2011-10-01	159.912
2012-01-01	461.938
2012-04-01	188.264
2012-07-01	220.532
2012-10-01	221.319
2013-01-01	239.641
2013-04-01	236.277
2013-07-01	246.186
2013-10-01	305.881
2014-01-01	353.485
2014-04-01	361.202
2014-07-01	228.238
2014-10-01	195.533
2015-01-01	287.246
2015-04-01	204.375