Quarter	Billions of US Dollars
1993-07-01	22.018
1993-10-01	22.863
1994-01-01	17.585
1994-04-01	62.937
1994-07-01	24.091
1994-10-01	25.359
1995-01-01	18.299
1995-04-01	23.527
1995-07-01	15.205
1995-10-01	13.780
1996-01-01	27.931
1996-04-01	63.469
1996-07-01	75.268
1996-10-01	18.699
1997-01-01	32.030
1997-04-01	27.102
1997-07-01	24.945
1997-10-01	10.308
1998-01-01	32.911
1998-04-01	28.679
1998-07-01	19.698
1998-10-01	19.103
1999-01-01	26.494
1999-04-01	22.313
1999-07-01	12.574
1999-10-01	18.544
2000-01-01	55.425
2000-04-01	17.306
2000-07-01	27.855
2000-10-01	6.965
2001-01-01	46.058
2001-04-01	59.871
2001-07-01	14.323
2001-10-01	23.195
2002-01-01	50.508
2002-04-01	16.443
2002-07-01	16.057
2002-10-01	21.551
2003-01-01	58.683
2003-04-01	58.546
2003-07-01	21.742
2003-10-01	26.027
2004-01-01	47.157
2004-04-01	31.644
2004-07-01	23.142
2004-10-01	23.990
2005-01-01	69.901
2005-04-01	46.921
2005-07-01	22.053
2005-10-01	37.709
2006-01-01	61.957
2006-04-01	25.424
2006-07-01	33.483
2006-10-01	32.117
2007-01-01	41.726
2007-04-01	37.038
2007-07-01	17.219
2007-10-01	9.036
2008-01-01	46.007
2008-04-01	55.522
2008-07-01	15.806
2008-10-01	15.039
2009-01-01	79.915
2009-04-01	100.243
2009-07-01	41.349
2009-10-01	43.601
2010-01-01	83.365
2010-04-01	53.905
2010-07-01	40.146
2010-10-01	37.339
2011-01-01	62.984
2011-04-01	55.645
2011-07-01	32.707
2011-10-01	21.211
2012-01-01	56.369
2012-04-01	53.465
2012-07-01	23.569
2012-10-01	45.221
2013-01-01	40.997
2013-04-01	48.341
2013-07-01	51.862
2013-10-01	34.201
2014-01-01	62.631
2014-04-01	73.151
2014-07-01	53.320
2014-10-01	40.554
2015-01-01	67.026
2015-04-01	35.057