Quarter	Billions of US Dollars
1994-01-01	0.179
1994-04-01	0.188
1994-07-01	0.194
1994-10-01	0.194
1995-01-01	0.217
1995-04-01	0.217
1995-07-01	0.211
1995-10-01	0.209
1996-01-01	0.203
1996-04-01	0.197
1996-07-01	0.196
1996-10-01	0.193
1997-01-01	0.179
1997-04-01	0.172
1997-07-01	0.170
1997-10-01	0.167
1998-01-01	0.162
1998-04-01	0.166
1998-07-01	0.179
1998-10-01	0.179
1999-01-01	0.165
1999-04-01	0.365
1999-07-01	1.493
1999-10-01	1.450
2000-01-01	2.398
2000-04-01	3.009
2000-07-01	3.019
2000-10-01	4.229
2001-01-01	5.785
2001-04-01	5.694
2001-07-01	7.814
2001-10-01	10.847
2002-01-01	13.135
2002-04-01	17.274
2002-07-01	20.108
2002-10-01	24.776
2003-01-01	30.303
2003-04-01	37.492
2003-07-01	39.728
2003-10-01	46.091
2004-01-01	50.381
2004-04-01	51.056
2004-07-01	53.468
2004-10-01	63.594
2005-01-01	66.069
2005-04-01	70.679
2005-07-01	72.811
2005-10-01	79.608
2006-01-01	94.110
2006-04-01	103.975
2006-07-01	109.411
2006-10-01	114.257
2007-01-01	122.569
2007-04-01	128.815
2007-07-01	135.647
2007-10-01	141.528
2008-01-01	150.165
2008-04-01	154.304
2008-07-01	140.060
2008-10-01	135.689
2009-01-01	131.906
2009-04-01	138.815
2009-07-01	139.474
2009-10-01	141.131
2010-01-01	129.530
2010-04-01	113.566
2010-07-01	131.282
2010-10-01	127.534
2011-01-01	132.851
2011-04-01	138.195
2011-07-01	124.894
2011-10-01	117.693
2012-01-01	106.447
2012-04-01	101.649
2012-07-01	105.281
2012-10-01	108.075
2013-01-01	101.129
2013-04-01	100.093
2013-07-01	99.453
2013-10-01	100.461
2014-01-01	95.397
2014-04-01	92.700
2014-07-01	87.353
2014-10-01	87.131
2015-01-01	76.303
2015-04-01	81.297