Quarter	Billions of US Dollars
1993-07-01	6.074
1993-10-01	5.875
1994-01-01	4.882
1994-04-01	3.887
1994-07-01	3.208
1994-10-01	3.145
1995-01-01	4.351
1995-04-01	4.835
1995-07-01	4.496
1995-10-01	4.669
1996-01-01	4.213
1996-04-01	4.290
1996-07-01	4.893
1996-10-01	6.994
1997-01-01	6.856
1997-04-01	8.237
1997-07-01	7.799
1997-10-01	7.744
1998-01-01	10.093
1998-04-01	8.377
1998-07-01	9.158
1998-10-01	8.933
1999-01-01	9.267
1999-04-01	11.494
1999-07-01	13.827
1999-10-01	13.393
2000-01-01	13.018
2000-04-01	12.036
2000-07-01	8.825
2000-10-01	9.572
2001-01-01	8.215
2001-04-01	9.974
2001-07-01	12.530
2001-10-01	15.216
2002-01-01	20.295
2002-04-01	15.094
2002-07-01	16.868
2002-10-01	14.387
2003-01-01	15.735
2003-04-01	17.467
2003-07-01	15.232
2003-10-01	16.879
2004-01-01	17.745
2004-04-01	13.045
2004-07-01	13.362
2004-10-01	12.264
2005-01-01	12.835
2005-04-01	13.664
2005-07-01	14.229
2005-10-01	17.909
2006-01-01	27.228
2006-04-01	19.830
2006-07-01	27.443
2006-10-01	26.501
2007-01-01	28.217
2007-04-01	32.035
2007-07-01	30.641
2007-10-01	46.915
2008-01-01	46.622
2008-04-01	56.707
2008-07-01	55.700
2008-10-01	38.980
2009-01-01	43.991
2009-04-01	46.993
2009-07-01	56.411
2009-10-01	57.951
2010-01-01	61.218
2010-04-01	54.254
2010-07-01	62.013
2010-10-01	69.964
2011-01-01	62.753
2011-04-01	79.379
2011-07-01	54.666
2011-10-01	61.196
2012-01-01	66.880
2012-04-01	68.719
2012-07-01	74.934
2012-10-01	66.770
2013-01-01	70.806
2013-04-01	61.388
2013-07-01	76.453
2013-10-01	89.561
2014-01-01	90.613
2014-04-01	97.624
2014-07-01	100.952
2014-10-01	108.411
2015-01-01	103.324
2015-04-01	100.438