Quarter	Billions of US Dollars
1989-07-01	1.043
1989-10-01	1.108
1990-01-01	1.488
1990-04-01	1.865
1990-07-01	2.232
1990-10-01	3.303
1991-01-01	4.319
1991-04-01	4.831
1991-07-01	6.420
1991-10-01	5.947
1992-01-01	6.271
1992-04-01	9.118
1992-07-01	8.252
1992-10-01	5.720
1993-01-01	5.071
1993-04-01	5.567
1993-07-01	5.826
1993-10-01	6.449
1994-01-01	7.880
1994-04-01	8.909
1994-07-01	8.833
1994-10-01	7.051
1995-01-01	6.665
1995-04-01	7.146
1995-07-01	9.337
1995-10-01	10.061
1996-01-01	9.330
1996-04-01	8.566
1996-07-01	7.771
1996-10-01	8.558
1997-01-01	9.272
1997-04-01	9.894
1997-07-01	10.577
1997-10-01	11.650
1998-01-01	12.279
1998-04-01	9.802
1998-07-01	9.957
1998-10-01	11.205
1999-01-01	18.661
1999-04-01	23.276
1999-07-01	41.478
1999-10-01	56.346
2000-01-01	65.126
2000-04-01	75.495
2000-07-01	71.505
2000-10-01	84.721
2001-01-01	72.520
2001-04-01	58.150
2001-07-01	50.724
2001-10-01	38.743
2002-01-01	36.980
2002-04-01	45.419
2002-07-01	50.961
2002-10-01	47.589
2003-01-01	52.784
2003-04-01	52.138
2003-07-01	50.178
2003-10-01	50.524
2004-01-01	60.212
2004-04-01	61.082
2004-07-01	58.267
2004-10-01	72.632
2005-01-01	68.025
2005-04-01	59.904
2005-07-01	65.775
2005-10-01	62.146
2006-01-01	64.730
2006-04-01	68.732
2006-07-01	68.102
2006-10-01	70.239
2007-01-01	76.575
2007-04-01	84.403
2007-07-01	138.044
2007-10-01	173.708
2008-01-01	222.818
2008-04-01	238.528
2008-07-01	196.938
2008-10-01	164.558
2009-01-01	148.759
2009-04-01	133.989
2009-07-01	144.578
2009-10-01	118.576
2010-01-01	127.876
2010-04-01	123.354
2010-07-01	126.419
2010-10-01	123.372
2011-01-01	133.193
2011-04-01	120.708
2011-07-01	113.238
2011-10-01	112.698
2012-01-01	171.340
2012-04-01	156.396
2012-07-01	143.104
2012-10-01	149.909
2013-01-01	134.670
2013-04-01	144.173
2013-07-01	144.236
2013-10-01	152.362
2014-01-01	128.335
2014-04-01	127.471
2014-07-01	121.991
2014-10-01	115.879
2015-01-01	117.241
2015-04-01	138.322