Quarter	Billions of US Dollars
1993-07-01	0.127
1993-10-01	0.119
1994-01-01	0.123
1994-04-01	0.129
1994-07-01	0.132
1994-10-01	0.133
1995-01-01	0.143
1995-04-01	0.151
1995-07-01	0.149
1995-10-01	0.113
1996-01-01	0.150
1996-04-01	0.389
1996-07-01	0.604
1996-10-01	0.687
1997-01-01	0.656
1997-04-01	0.828
1997-07-01	0.850
1997-10-01	0.975
1998-01-01	0.988
1998-04-01	1.148
1998-07-01	1.481
1998-10-01	1.629
1999-01-01	2.084
1999-04-01	2.537
1999-07-01	2.812
1999-10-01	2.948
2000-01-01	2.833
2000-04-01	3.161
2000-07-01	3.255
2000-10-01	3.851
2001-01-01	4.153
2001-04-01	4.456
2001-07-01	5.141
2001-10-01	5.611
2002-01-01	6.679
2002-04-01	8.756
2002-07-01	12.616
2002-10-01	17.285
2003-01-01	18.063
2003-04-01	19.433
2003-07-01	20.756
2003-10-01	22.011
2004-01-01	21.692
2004-04-01	20.888
2004-07-01	20.864
2004-10-01	22.837
2005-01-01	21.159
2005-04-01	19.989
2005-07-01	20.004
2005-10-01	19.023
2006-01-01	20.039
2006-04-01	22.347
2006-07-01	21.828
2006-10-01	23.286
2007-01-01	23.305
2007-04-01	25.844
2007-07-01	27.940
2007-10-01	28.626
2008-01-01	32.167
2008-04-01	35.251
2008-07-01	31.852
2008-10-01	27.676
2009-01-01	34.711
2009-04-01	38.958
2009-07-01	48.018
2009-10-01	50.262
2010-01-01	52.043
2010-04-01	50.597
2010-07-01	56.638
2010-10-01	57.965
2011-01-01	65.786
2011-04-01	72.289
2011-07-01	76.075
2011-10-01	82.679
2012-01-01	93.862
2012-04-01	92.678
2012-07-01	100.401
2012-10-01	104.063
2013-01-01	99.304
2013-04-01	97.670
2013-07-01	95.883
2013-10-01	94.520
2014-01-01	96.933
2014-04-01	87.151
2014-07-01	82.485
2014-10-01	69.695
2015-01-01	63.209
2015-04-01	64.852