Quarter	Billions of US Dollars
1993-07-01	13.390
1993-10-01	18.921
1994-01-01	14.397
1994-04-01	6.937
1994-07-01	3.300
1994-10-01	19.405
1995-01-01	17.777
1995-04-01	14.239
1995-07-01	16.206
1995-10-01	14.929
1996-01-01	28.037
1996-04-01	22.680
1996-07-01	11.669
1996-10-01	30.752
1997-01-01	27.062
1997-04-01	13.958
1997-07-01	27.844
1997-10-01	9.896
1998-01-01	44.550
1998-04-01	46.925
1998-07-01	33.207
1998-10-01	9.466
1999-01-01	50.785
1999-04-01	61.520
1999-07-01	64.782
1999-10-01	43.193
2000-01-01	52.397
2000-04-01	44.242
2000-07-01	45.657
2000-10-01	47.653
2001-01-01	101.340
2001-04-01	91.025
2001-07-01	32.402
2001-10-01	60.185
2002-01-01	79.486
2002-04-01	76.672
2002-07-01	38.274
2002-10-01	36.296
2003-01-01	120.484
2003-04-01	131.929
2003-07-01	77.768
2003-10-01	70.224
2004-01-01	115.136
2004-04-01	80.375
2004-07-01	68.609
2004-10-01	91.599
2005-01-01	127.921
2005-04-01	96.678
2005-07-01	58.048
2005-10-01	89.364
2006-01-01	153.694
2006-04-01	95.302
2006-07-01	80.224
2006-10-01	140.299
2007-01-01	132.335
2007-04-01	170.142
2007-07-01	56.510
2007-10-01	110.750
2008-01-01	50.380
2008-04-01	246.998
2008-07-01	15.092
2008-10-01	59.705
2009-01-01	186.113
2009-04-01	316.527
2009-07-01	128.714
2009-10-01	145.261
2010-01-01	168.213
2010-04-01	26.227
2010-07-01	44.120
2010-10-01	31.411
2011-01-01	112.550
2011-04-01	26.024
2011-07-01	7.403
2011-10-01	11.435
2012-01-01	205.387
2012-04-01	8.607
2012-07-01	73.363
2012-10-01	95.433
2013-01-01	-86.044
2013-04-01	-1.834
2013-07-01	41.473
2013-10-01	75.333
2014-01-01	-26.362
2014-04-01	44.104
2014-07-01	17.214
2014-10-01	0.951
2015-01-01	59.596
2015-04-01	25.970