Quarter	Billions of US Dollars
1989-07-01	20.473
1989-10-01	21.772
1990-01-01	23.878
1990-04-01	23.091
1990-07-01	26.008
1990-10-01	24.418
1991-01-01	27.198
1991-04-01	26.323
1991-07-01	26.459
1991-10-01	29.418
1992-01-01	30.330
1992-04-01	26.999
1992-07-01	22.148
1992-10-01	21.893
1993-01-01	18.065
1993-04-01	17.688
1993-07-01	49.547
1993-10-01	51.959
1994-01-01	52.079
1994-04-01	57.961
1994-07-01	59.377
1994-10-01	52.296
1995-01-01	52.628
1995-04-01	55.015
1995-07-01	61.045
1995-10-01	61.288
1996-01-01	66.826
1996-04-01	74.504
1996-07-01	73.418
1996-10-01	74.478
1997-01-01	79.369
1997-04-01	76.387
1997-07-01	81.975
1997-10-01	79.956
1998-01-01	85.918
1998-04-01	87.321
1998-07-01	97.591
1998-10-01	98.082
1999-01-01	116.404
1999-04-01	111.256
1999-07-01	129.487
1999-10-01	127.992
2000-01-01	128.942
2000-04-01	131.527
2000-07-01	147.071
2000-10-01	164.807
2001-01-01	184.398
2001-04-01	186.993
2001-07-01	178.273
2001-10-01	177.804
2002-01-01	183.739
2002-04-01	198.148
2002-07-01	215.566
2002-10-01	224.737
2003-01-01	263.372
2003-04-01	277.248
2003-07-01	268.148
2003-10-01	331.287
2004-01-01	328.914
2004-04-01	327.391
2004-07-01	365.724
2004-10-01	407.255
2005-01-01	421.198
2005-04-01	415.719
2005-07-01	414.381
2005-10-01	404.693
2006-01-01	455.733
2006-04-01	487.346
2006-07-01	524.608
2006-10-01	564.751
2007-01-01	664.217
2007-04-01	702.942
2007-07-01	651.657
2007-10-01	619.112
2008-01-01	688.241
2008-04-01	681.204
2008-07-01	624.732
2008-10-01	531.765
2009-01-01	508.237
2009-04-01	525.481
2009-07-01	564.348
2009-10-01	505.998
2010-01-01	499.475
2010-04-01	433.862
2010-07-01	460.883
2010-10-01	424.579
2011-01-01	457.464
2011-04-01	457.831
2011-07-01	465.538
2011-10-01	459.782
2012-01-01	506.778
2012-04-01	453.814
2012-07-01	446.031
2012-10-01	402.514
2013-01-01	419.684
2013-04-01	424.960
2013-07-01	448.205
2013-10-01	413.865
2014-01-01	445.530
2014-04-01	456.681
2014-07-01	451.925
2014-10-01	431.142
2015-01-01	430.050
2015-04-01	413.115