Quarter	Billions of US Dollars
1993-07-01	12.077
1993-10-01	27.452
1994-01-01	33.667
1994-04-01	52.224
1994-07-01	20.519
1994-10-01	17.392
1995-01-01	16.727
1995-04-01	16.687
1995-07-01	15.971
1995-10-01	20.105
1996-01-01	38.284
1996-04-01	45.998
1996-07-01	56.795
1996-10-01	63.583
1997-01-01	57.686
1997-04-01	76.399
1997-07-01	72.549
1997-10-01	30.094
1998-01-01	81.070
1998-04-01	99.791
1998-07-01	49.634
1998-10-01	13.327
1999-01-01	83.446
1999-04-01	98.926
1999-07-01	78.047
1999-10-01	32.296
2000-01-01	82.642
2000-04-01	77.636
2000-07-01	118.187
2000-10-01	108.557
2001-01-01	185.830
2001-04-01	152.720
2001-07-01	104.209
2001-10-01	115.582
2002-01-01	126.275
2002-04-01	116.615
2002-07-01	24.201
2002-10-01	49.592
2003-01-01	37.966
2003-04-01	54.894
2003-07-01	117.942
2003-10-01	93.924
2004-01-01	102.641
2004-04-01	37.559
2004-07-01	52.463
2004-10-01	69.361
2005-01-01	59.248
2005-04-01	50.807
2005-07-01	44.713
2005-10-01	130.573
2006-01-01	74.615
2006-04-01	148.593
2006-07-01	160.068
2006-10-01	245.355
2007-01-01	168.167
2007-04-01	267.195
2007-07-01	123.307
2007-10-01	67.330
2008-01-01	20.903
2008-04-01	131.846
2008-07-01	4.852
2008-10-01	-33.458
2009-01-01	72.897
2009-04-01	170.681
2009-07-01	97.692
2009-10-01	159.073
2010-01-01	123.867
2010-04-01	40.223
2010-07-01	133.456
2010-10-01	101.809
2011-01-01	127.565
2011-04-01	75.851
2011-07-01	38.247
2011-10-01	57.023
2012-01-01	164.126
2012-04-01	87.758
2012-07-01	142.554
2012-10-01	183.886
2013-01-01	179.238
2013-04-01	181.052
2013-07-01	88.230
2013-10-01	186.209
2014-01-01	128.390
2014-04-01	199.917
2014-07-01	181.243
2014-10-01	98.064
2015-01-01	152.076
2015-04-01	198.378