Quarter	Billions of US Dollars
1987-01-01	31.939
1987-04-01	29.008
1987-07-01	22.938
1987-10-01	11.027
1988-01-01	22.832
1988-04-01	32.771
1988-07-01	38.542
1988-10-01	25.615
1989-01-01	47.109
1989-04-01	44.183
1989-07-01	32.967
1989-10-01	33.563
1990-01-01	77.742
1990-04-01	25.191
1990-07-01	50.770
1990-10-01	51.379
1991-01-01	65.207
1991-04-01	50.199
1991-07-01	41.316
1991-10-01	44.399
1992-01-01	47.555
1992-04-01	38.675
1992-07-01	22.030
1992-10-01	53.110
1993-01-01	28.832
1993-04-01	60.532
1993-07-01	137.885
1993-10-01	70.442
1994-01-01	76.081
1994-04-01	77.463
1994-07-01	73.768
1994-10-01	55.262
1995-01-01	48.803
1995-04-01	57.610
1995-07-01	79.859
1995-10-01	67.337
1996-01-01	102.135
1996-04-01	122.887
1996-07-01	99.292
1996-10-01	145.878
1997-01-01	141.873
1997-04-01	136.176
1997-07-01	145.849
1997-10-01	46.290
1998-01-01	152.461
1998-04-01	178.660
1998-07-01	112.573
1998-10-01	44.743
1999-01-01	209.240
1999-04-01	254.470
1999-07-01	238.255
1999-10-01	148.641
2000-01-01	210.545
2000-04-01	241.081
2000-07-01	263.627
2000-10-01	262.074
2001-01-01	364.691
2001-04-01	290.982
2001-07-01	158.939
2001-10-01	274.917
2002-01-01	235.824
2002-04-01	264.990
2002-07-01	119.868
2002-10-01	133.751
2003-01-01	272.108
2003-04-01	280.038
2003-07-01	239.961
2003-10-01	357.015
2004-01-01	369.678
2004-04-01	265.561
2004-07-01	293.967
2004-10-01	339.265
2005-01-01	380.541
2005-04-01	377.526
2005-07-01	191.439
2005-10-01	467.951
2006-01-01	520.084
2006-04-01	485.626
2006-07-01	479.772
2006-10-01	762.300
2007-01-01	770.608
2007-04-01	940.232
2007-07-01	271.131
2007-10-01	284.731
2008-01-01	300.376
2008-04-01	790.696
2008-07-01	183.681
2008-10-01	341.830
2009-01-01	323.219
2009-04-01	504.955
2009-07-01	321.827
2009-10-01	154.125
2010-01-01	355.504
2010-04-01	-32.280
2010-07-01	269.935
2010-10-01	38.423
2011-01-01	250.917
2011-04-01	135.837
2011-07-01	27.999
2011-10-01	60.853
2012-01-01	467.982
2012-04-01	-64.622
2012-07-01	99.969
2012-10-01	229.164
2013-01-01	23.660
2013-04-01	118.724
2013-07-01	134.866
2013-10-01	231.173
2014-01-01	55.779
2014-04-01	296.524
2014-07-01	233.816
2014-10-01	63.626
2015-01-01	224.709
2015-04-01	219.142