Quarter	Billions of US Dollars
1993-07-01	5.839
1993-10-01	5.005
1994-01-01	4.088
1994-04-01	3.357
1994-07-01	2.651
1994-10-01	2.719
1995-01-01	4.024
1995-04-01	4.451
1995-07-01	4.291
1995-10-01	4.698
1996-01-01	3.909
1996-04-01	4.258
1996-07-01	4.920
1996-10-01	6.272
1997-01-01	6.604
1997-04-01	7.388
1997-07-01	6.710
1997-10-01	7.333
1998-01-01	8.156
1998-04-01	7.062
1998-07-01	8.247
1998-10-01	8.021
1999-01-01	7.919
1999-04-01	11.230
1999-07-01	10.200
1999-10-01	10.299
2000-01-01	10.372
2000-04-01	9.782
2000-07-01	7.951
2000-10-01	8.271
2001-01-01	8.004
2001-04-01	10.091
2001-07-01	11.667
2001-10-01	12.380
2002-01-01	19.609
2002-04-01	14.300
2002-07-01	16.921
2002-10-01	14.707
2003-01-01	13.047
2003-04-01	17.164
2003-07-01	15.398
2003-10-01	18.092
2004-01-01	19.885
2004-04-01	13.944
2004-07-01	15.046
2004-10-01	13.521
2005-01-01	10.394
2005-04-01	11.657
2005-07-01	11.241
2005-10-01	14.042
2006-01-01	25.183
2006-04-01	18.181
2006-07-01	25.622
2006-10-01	24.296
2007-01-01	27.000
2007-04-01	28.602
2007-07-01	27.466
2007-10-01	43.188
2008-01-01	40.684
2008-04-01	47.589
2008-07-01	48.338
2008-10-01	33.852
2009-01-01	37.725
2009-04-01	37.513
2009-07-01	49.793
2009-10-01	47.965
2010-01-01	51.546
2010-04-01	47.836
2010-07-01	50.774
2010-10-01	60.982
2011-01-01	52.666
2011-04-01	70.403
2011-07-01	48.752
2011-10-01	56.965
2012-01-01	62.382
2012-04-01	66.131
2012-07-01	73.494
2012-10-01	65.024
2013-01-01	70.467
2013-04-01	59.019
2013-07-01	71.207
2013-10-01	78.709
2014-01-01	82.104
2014-04-01	90.945
2014-07-01	95.635
2014-10-01	104.449
2015-01-01	100.982
2015-04-01	93.918