Quarter	Billions of US Dollars
1993-07-01	14.992
1993-10-01	16.348
1994-01-01	16.049
1994-04-01	17.034
1994-07-01	18.437
1994-10-01	17.818
1995-01-01	22.050
1995-04-01	21.615
1995-07-01	25.643
1995-10-01	24.323
1996-01-01	22.530
1996-04-01	23.434
1996-07-01	17.911
1996-10-01	26.943
1997-01-01	30.206
1997-04-01	30.800
1997-07-01	32.137
1997-10-01	36.001
1998-01-01	37.168
1998-04-01	38.281
1998-07-01	39.100
1998-10-01	38.234
1999-01-01	43.203
1999-04-01	45.858
1999-07-01	55.262
1999-10-01	58.797
2000-01-01	62.230
2000-04-01	62.754
2000-07-01	61.415
2000-10-01	69.294
2001-01-01	74.888
2001-04-01	73.342
2001-07-01	85.130
2001-10-01	82.528
2002-01-01	83.978
2002-04-01	92.171
2002-07-01	107.031
2002-10-01	108.431
2003-01-01	129.295
2003-04-01	144.863
2003-07-01	153.800
2003-10-01	169.040
2004-01-01	176.519
2004-04-01	189.750
2004-07-01	198.003
2004-10-01	205.541
2005-01-01	201.065
2005-04-01	196.475
2005-07-01	222.931
2005-10-01	235.997
2006-01-01	254.826
2006-04-01	268.375
2006-07-01	279.978
2006-10-01	304.876
2007-01-01	316.741
2007-04-01	323.670
2007-07-01	339.512
2007-10-01	327.406
2008-01-01	385.548
2008-04-01	404.985
2008-07-01	377.085
2008-10-01	386.912
2009-01-01	338.405
2009-04-01	327.521
2009-07-01	341.630
2009-10-01	301.885
2010-01-01	312.104
2010-04-01	306.823
2010-07-01	343.800
2010-10-01	374.995
2011-01-01	424.399
2011-04-01	481.127
2011-07-01	451.394
2011-10-01	374.236
2012-01-01	338.810
2012-04-01	263.511
2012-07-01	259.545
2012-10-01	250.077
2013-01-01	248.652
2013-04-01	237.067
2013-07-01	253.737
2013-10-01	252.488
2014-01-01	265.545
2014-04-01	255.967
2014-07-01	230.426
2014-10-01	216.092
2015-01-01	185.091
2015-04-01	175.847