Quarter	Billions of US Dollars
1993-07-01	17.610
1993-10-01	16.310
1994-01-01	17.145
1994-04-01	16.854
1994-07-01	18.608
1994-10-01	19.217
1995-01-01	22.044
1995-04-01	21.703
1995-07-01	21.734
1995-10-01	23.480
1996-01-01	21.455
1996-04-01	27.532
1996-07-01	21.346
1996-10-01	24.930
1997-01-01	26.495
1997-04-01	22.778
1997-07-01	25.799
1997-10-01	27.152
1998-01-01	34.124
1998-04-01	31.452
1998-07-01	34.299
1998-10-01	33.775
1999-01-01	28.919
1999-04-01	29.247
1999-07-01	31.184
1999-10-01	33.992
2000-01-01	37.878
2000-04-01	36.449
2000-07-01	38.293
2000-10-01	42.674
2001-01-01	43.158
2001-04-01	38.441
2001-07-01	42.735
2001-10-01	43.591
2002-01-01	41.892
2002-04-01	54.948
2002-07-01	48.746
2002-10-01	52.173
2003-01-01	52.705
2003-04-01	57.914
2003-07-01	70.515
2003-10-01	81.177
2004-01-01	89.150
2004-04-01	93.322
2004-07-01	98.759
2004-10-01	106.483
2005-01-01	116.185
2005-04-01	111.896
2005-07-01	120.417
2005-10-01	121.913
2006-01-01	127.829
2006-04-01	131.958
2006-07-01	132.103
2006-10-01	149.555
2007-01-01	150.784
2007-04-01	178.769
2007-07-01	179.859
2007-10-01	212.580
2008-01-01	257.499
2008-04-01	281.051
2008-07-01	259.522
2008-10-01	232.899
2009-01-01	218.089
2009-04-01	253.706
2009-07-01	263.161
2009-10-01	276.320
2010-01-01	276.937
2010-04-01	248.958
2010-07-01	275.344
2010-10-01	252.891
2011-01-01	310.276
2011-04-01	308.562
2011-07-01	279.574
2011-10-01	277.875
2012-01-01	288.556
2012-04-01	245.755
2012-07-01	267.720
2012-10-01	258.278
2013-01-01	265.075
2013-04-01	296.164
2013-07-01	295.868
2013-10-01	289.259
2014-01-01	297.438
2014-04-01	282.792
2014-07-01	279.762
2014-10-01	255.644
2015-01-01	236.383
2015-04-01	230.721