Quarter	Billions of US Dollars
1993-07-01	7.668
1993-10-01	7.509
1994-01-01	7.386
1994-04-01	8.060
1994-07-01	8.121
1994-10-01	8.699
1995-01-01	8.969
1995-04-01	8.955
1995-07-01	8.268
1995-10-01	9.131
1996-01-01	8.977
1996-04-01	8.209
1996-07-01	7.198
1996-10-01	7.863
1997-01-01	7.936
1997-04-01	9.429
1997-07-01	8.505
1997-10-01	8.747
1998-01-01	8.005
1998-04-01	9.403
1998-07-01	10.674
1998-10-01	9.751
1999-01-01	10.852
1999-04-01	11.830
1999-07-01	12.236
1999-10-01	15.372
2000-01-01	16.159
2000-04-01	21.178
2000-07-01	22.151
2000-10-01	33.609
2001-01-01	33.187
2001-04-01	36.308
2001-07-01	37.120
2001-10-01	35.770
2002-01-01	34.672
2002-04-01	45.261
2002-07-01	46.868
2002-10-01	48.774
2003-01-01	57.176
2003-04-01	64.764
2003-07-01	61.284
2003-10-01	64.050
2004-01-01	66.142
2004-04-01	67.829
2004-07-01	70.992
2004-10-01	78.128
2005-01-01	79.111
2005-04-01	74.635
2005-07-01	63.168
2005-10-01	71.867
2006-01-01	75.427
2006-04-01	92.816
2006-07-01	93.477
2006-10-01	94.011
2007-01-01	96.675
2007-04-01	99.591
2007-07-01	103.862
2007-10-01	101.681
2008-01-01	107.090
2008-04-01	116.061
2008-07-01	110.763
2008-10-01	104.204
2009-01-01	94.727
2009-04-01	109.061
2009-07-01	115.387
2009-10-01	112.828
2010-01-01	109.717
2010-04-01	103.930
2010-07-01	117.139
2010-10-01	111.899
2011-01-01	117.491
2011-04-01	128.714
2011-07-01	122.040
2011-10-01	111.207
2012-01-01	117.933
2012-04-01	122.824
2012-07-01	126.901
2012-10-01	135.673
2013-01-01	139.435
2013-04-01	152.625
2013-07-01	158.135
2013-10-01	170.661
2014-01-01	179.287
2014-04-01	178.240
2014-07-01	171.029
2014-10-01	174.199
2015-01-01	158.617
2015-04-01	174.938