Quarter	Billions of US Dollars
1987-01-01	5.541
1987-04-01	6.061
1987-07-01	4.098
1987-10-01	2.412
1988-01-01	5.775
1988-04-01	10.088
1988-07-01	8.283
1988-10-01	7.393
1989-01-01	15.739
1989-04-01	6.198
1989-07-01	8.691
1989-10-01	8.262
1990-01-01	9.427
1990-04-01	3.229
1990-07-01	7.527
1990-10-01	3.847
1991-01-01	2.633
1991-04-01	6.848
1991-07-01	4.518
1991-10-01	5.250
1992-01-01	2.322
1992-04-01	5.209
1992-07-01	2.696
1992-10-01	6.834
1993-01-01	2.114
1993-04-01	3.021
1993-07-01	42.309
1993-10-01	20.147
1994-01-01	20.695
1994-04-01	6.113
1994-07-01	21.112
1994-10-01	17.300
1995-01-01	20.913
1995-04-01	14.781
1995-07-01	21.151
1995-10-01	23.000
1996-01-01	30.726
1996-04-01	41.835
1996-07-01	35.728
1996-10-01	43.186
1997-01-01	42.717
1997-04-01	38.853
1997-07-01	47.358
1997-10-01	10.732
1998-01-01	43.867
1998-04-01	40.014
1998-07-01	41.380
1998-10-01	7.695
1999-01-01	74.047
1999-04-01	62.256
1999-07-01	91.210
1999-10-01	54.047
2000-01-01	77.499
2000-04-01	83.994
2000-07-01	61.237
2000-10-01	66.563
2001-01-01	97.062
2001-04-01	67.938
2001-07-01	30.645
2001-10-01	47.914
2002-01-01	54.298
2002-04-01	78.661
2002-07-01	24.801
2002-10-01	41.300
2003-01-01	116.927
2003-04-01	103.031
2003-07-01	84.433
2003-10-01	168.543
2004-01-01	212.827
2004-04-01	98.495
2004-07-01	171.508
2004-10-01	167.376
2005-01-01	224.407
2005-04-01	206.273
2005-07-01	121.462
2005-10-01	181.165
2006-01-01	271.897
2006-04-01	166.143
2006-07-01	180.752
2006-10-01	281.426
2007-01-01	366.487
2007-04-01	342.567
2007-07-01	174.765
2007-10-01	157.097
2008-01-01	200.512
2008-04-01	438.149
2008-07-01	65.329
2008-10-01	9.890
2009-01-01	-57.916
2009-04-01	96.210
2009-07-01	102.201
2009-10-01	-13.703
2010-01-01	199.365
2010-04-01	-85.113
2010-07-01	111.527
2010-10-01	-72.156
2011-01-01	133.911
2011-04-01	11.386
2011-07-01	-83.203
2011-10-01	-132.623
2012-01-01	87.707
2012-04-01	-116.202
2012-07-01	-92.003
2012-10-01	-84.901
2013-01-01	-105.248
2013-04-01	-91.363
2013-07-01	-33.729
2013-10-01	41.959
2014-01-01	-54.395
2014-04-01	15.735
2014-07-01	22.890
2014-10-01	-65.705
2015-01-01	26.885
2015-04-01	-18.594