Quarter	Billions of US Dollars
1993-07-01	10.175
1993-10-01	6.823
1994-01-01	9.833
1994-04-01	2.523
1994-07-01	4.747
1994-10-01	2.009
1995-01-01	2.101
1995-04-01	2.891
1995-07-01	2.979
1995-10-01	1.312
1996-01-01	7.235
1996-04-01	3.668
1996-07-01	5.182
1996-10-01	17.510
1997-01-01	21.471
1997-04-01	10.183
1997-07-01	11.818
1997-10-01	4.388
1998-01-01	17.674
1998-04-01	14.021
1998-07-01	5.653
1998-10-01	17.347
1999-01-01	17.979
1999-04-01	26.029
1999-07-01	19.180
1999-10-01	13.737
2000-01-01	15.957
2000-04-01	17.238
2000-07-01	26.810
2000-10-01	29.674
2001-01-01	16.297
2001-04-01	12.608
2001-07-01	13.639
2001-10-01	21.689
2002-01-01	8.016
2002-04-01	15.540
2002-07-01	14.083
2002-10-01	14.051
2003-01-01	15.694
2003-04-01	18.057
2003-07-01	23.067
2003-10-01	31.375
2004-01-01	31.210
2004-04-01	37.046
2004-07-01	25.793
2004-10-01	41.124
2005-01-01	48.682
2005-04-01	36.874
2005-07-01	37.063
2005-10-01	73.547
2006-01-01	60.993
2006-04-01	48.155
2006-07-01	41.557
2006-10-01	71.508
2007-01-01	70.443
2007-04-01	79.697
2007-07-01	47.997
2007-10-01	28.012
2008-01-01	30.044
2008-04-01	144.705
2008-07-01	151.604
2008-10-01	225.903
2009-01-01	93.969
2009-04-01	46.068
2009-07-01	61.472
2009-10-01	-19.568
2010-01-01	2.439
2010-04-01	-13.335
2010-07-01	1.383
2010-10-01	-40.413
2011-01-01	-22.202
2011-04-01	21.164
2011-07-01	-24.328
2011-10-01	-34.511
2012-01-01	13.066
2012-04-01	-29.074
2012-07-01	12.518
2012-10-01	17.390
2013-01-01	16.634
2013-04-01	1.089
2013-07-01	6.896
2013-10-01	11.986
2014-01-01	5.096
2014-04-01	18.381
2014-07-01	10.582
2014-10-01	-27.409
2015-01-01	4.475
2015-04-01	24.055