Quarter	Billions of US Dollars
1993-07-01	9.005
1993-10-01	9.497
1994-01-01	9.174
1994-04-01	10.998
1994-07-01	11.210
1994-10-01	11.104
1995-01-01	10.956
1995-04-01	11.548
1995-07-01	13.981
1995-10-01	17.962
1996-01-01	18.278
1996-04-01	18.200
1996-07-01	13.083
1996-10-01	15.092
1997-01-01	14.045
1997-04-01	13.631
1997-07-01	14.101
1997-10-01	17.157
1998-01-01	18.624
1998-04-01	19.195
1998-07-01	18.255
1998-10-01	20.858
1999-01-01	21.697
1999-04-01	20.772
1999-07-01	26.671
1999-10-01	25.655
2000-01-01	23.411
2000-04-01	29.084
2000-07-01	28.011
2000-10-01	32.777
2001-01-01	33.721
2001-04-01	36.843
2001-07-01	43.735
2001-10-01	52.299
2002-01-01	49.420
2002-04-01	52.712
2002-07-01	54.622
2002-10-01	53.739
2003-01-01	58.470
2003-04-01	59.842
2003-07-01	67.901
2003-10-01	74.386
2004-01-01	73.391
2004-04-01	74.692
2004-07-01	69.781
2004-10-01	75.823
2005-01-01	70.088
2005-04-01	69.562
2005-07-01	68.120
2005-10-01	75.904
2006-01-01	76.238
2006-04-01	83.238
2006-07-01	85.389
2006-10-01	86.022
2007-01-01	94.512
2007-04-01	105.111
2007-07-01	120.616
2007-10-01	140.889
2008-01-01	162.063
2008-04-01	179.382
2008-07-01	169.894
2008-10-01	150.103
2009-01-01	153.271
2009-04-01	153.608
2009-07-01	160.342
2009-10-01	153.783
2010-01-01	149.352
2010-04-01	141.381
2010-07-01	169.530
2010-10-01	142.991
2011-01-01	184.988
2011-04-01	193.858
2011-07-01	180.888
2011-10-01	199.199
2012-01-01	184.076
2012-04-01	148.991
2012-07-01	136.336
2012-10-01	126.777
2013-01-01	122.205
2013-04-01	133.077
2013-07-01	168.154
2013-10-01	150.346
2014-01-01	133.116
2014-04-01	119.040
2014-07-01	97.623
2014-10-01	92.073
2015-01-01	88.369
2015-04-01	92.811