Quarter	Billions of US Dollars
1993-07-01	0.170
1993-10-01	0.424
1994-01-01	0.408
1994-04-01	0.385
1994-07-01	0.279
1994-10-01	0.075
1995-01-01	0.294
1995-04-01	0.219
1995-07-01	0.304
1995-10-01	0.281
1996-01-01	0.149
1996-04-01	0.167
1996-07-01	0.153
1996-10-01	0.761
1997-01-01	2.490
1997-04-01	2.538
1997-07-01	2.700
1997-10-01	2.465
1998-01-01	0.990
1998-04-01	1.128
1998-07-01	1.751
1998-10-01	1.484
1999-01-01	2.136
1999-04-01	2.960
1999-07-01	4.193
1999-10-01	4.216
2000-01-01	4.823
2000-04-01	5.971
2000-07-01	4.296
2000-10-01	4.030
2001-01-01	5.156
2001-04-01	4.170
2001-07-01	5.595
2001-10-01	4.379
2002-01-01	6.995
2002-04-01	7.963
2002-07-01	9.648
2002-10-01	12.506
2003-01-01	13.384
2003-04-01	15.877
2003-07-01	16.854
2003-10-01	18.579
2004-01-01	23.531
2004-04-01	24.294
2004-07-01	30.742
2004-10-01	36.566
2005-01-01	44.300
2005-04-01	43.516
2005-07-01	47.330
2005-10-01	48.661
2006-01-01	51.495
2006-04-01	57.015
2006-07-01	66.012
2006-10-01	69.946
2007-01-01	83.082
2007-04-01	80.960
2007-07-01	84.747
2007-10-01	77.193
2008-01-01	82.566
2008-04-01	93.950
2008-07-01	82.176
2008-10-01	80.050
2009-01-01	81.650
2009-04-01	77.677
2009-07-01	122.771
2009-10-01	124.132
2010-01-01	115.654
2010-04-01	107.786
2010-07-01	67.931
2010-10-01	71.400
2011-01-01	43.864
2011-04-01	47.662
2011-07-01	44.183
2011-10-01	45.948
2012-01-01	84.804
2012-04-01	88.301
2012-07-01	72.547
2012-10-01	69.696
2013-01-01	60.334
2013-04-01	52.626
2013-07-01	66.769
2013-10-01	107.332
2014-01-01	98.473
2014-04-01	95.630
2014-07-01	87.212
2014-10-01	49.385
2015-01-01	20.350
2015-04-01	17.247