Quarter	Billions of US Dollars
1993-07-01	0.575
1993-10-01	0.540
1994-01-01	0.836
1994-04-01	1.224
1994-07-01	1.836
1994-10-01	2.680
1995-01-01	3.370
1995-04-01	3.492
1995-07-01	3.401
1995-10-01	6.320
1996-01-01	5.722
1996-04-01	3.006
1996-07-01	1.492
1996-10-01	1.819
1997-01-01	2.110
1997-04-01	2.291
1997-07-01	2.065
1997-10-01	3.502
1998-01-01	4.726
1998-04-01	2.683
1998-07-01	3.051
1998-10-01	5.083
1999-01-01	8.909
1999-04-01	10.190
1999-07-01	18.049
1999-10-01	23.764
2000-01-01	29.640
2000-04-01	28.151
2000-07-01	26.663
2000-10-01	36.770
2001-01-01	25.826
2001-04-01	27.061
2001-07-01	24.330
2001-10-01	25.066
2002-01-01	24.965
2002-04-01	29.956
2002-07-01	38.280
2002-10-01	37.771
2003-01-01	58.981
2003-04-01	48.281
2003-07-01	35.127
2003-10-01	40.378
2004-01-01	41.310
2004-04-01	42.072
2004-07-01	43.206
2004-10-01	40.345
2005-01-01	44.276
2005-04-01	43.670
2005-07-01	34.384
2005-10-01	26.048
2006-01-01	39.953
2006-04-01	38.524
2006-07-01	36.188
2006-10-01	28.599
2007-01-01	43.275
2007-04-01	54.428
2007-07-01	62.891
2007-10-01	83.856
2008-01-01	93.119
2008-04-01	99.259
2008-07-01	83.534
2008-10-01	69.451
2009-01-01	58.235
2009-04-01	58.837
2009-07-01	62.127
2009-10-01	59.352
2010-01-01	63.501
2010-04-01	60.877
2010-07-01	55.210
2010-10-01	62.563
2011-01-01	74.194
2011-04-01	78.042
2011-07-01	106.407
2011-10-01	112.812
2012-01-01	109.891
2012-04-01	101.688
2012-07-01	74.721
2012-10-01	64.657
2013-01-01	85.683
2013-04-01	92.853
2013-07-01	84.282
2013-10-01	71.424
2014-01-01	93.732
2014-04-01	89.937
2014-07-01	89.103
2014-10-01	82.431
2015-01-01	91.887
2015-04-01	73.342