Quarter	Billions of US Dollars
1987-01-01	0.130
1987-04-01	0.130
1987-07-01	0.130
1987-10-01	0.132
1988-01-01	0.235
1988-04-01	0.239
1988-07-01	0.314
1988-10-01	0.275
1989-01-01	0.303
1989-04-01	0.289
1989-07-01	0.194
1989-10-01	0.201
1990-01-01	0.182
1990-04-01	0.187
1990-07-01	0.166
1990-10-01	0.100
1991-01-01	0.120
1991-04-01	0.263
1991-07-01	0.266
1991-10-01	0.453
1992-01-01	0.422
1992-04-01	0.639
1992-07-01	0.633
1992-10-01	0.550
1993-01-01	0.547
1993-04-01	0.527
1993-07-01	0.733
1993-10-01	0.662
1994-01-01	0.694
1994-04-01	0.736
1994-07-01	0.729
1994-10-01	0.716
1995-01-01	0.774
1995-04-01	0.775
1995-07-01	0.892
1995-10-01	0.957
1996-01-01	0.895
1996-04-01	1.335
1996-07-01	1.164
1996-10-01	1.039
1997-01-01	1.166
1997-04-01	1.156
1997-07-01	1.191
1997-10-01	1.165
1998-01-01	1.428
1998-04-01	1.369
1998-07-01	1.347
1998-10-01	1.210
1999-01-01	2.207
1999-04-01	2.600
1999-07-01	3.561
1999-10-01	4.767
2000-01-01	6.743
2000-04-01	8.911
2000-07-01	10.807
2000-10-01	12.481
2001-01-01	13.901
2001-04-01	16.806
2001-07-01	18.723
2001-10-01	17.786
2002-01-01	20.052
2002-04-01	27.096
2002-07-01	25.824
2002-10-01	27.903
2003-01-01	29.974
2003-04-01	35.513
2003-07-01	36.715
2003-10-01	42.265
2004-01-01	44.760
2004-04-01	46.064
2004-07-01	48.540
2004-10-01	53.459
2005-01-01	52.152
2005-04-01	49.546
2005-07-01	45.341
2005-10-01	52.373
2006-01-01	57.243
2006-04-01	60.931
2006-07-01	62.957
2006-10-01	73.883
2007-01-01	75.453
2007-04-01	88.609
2007-07-01	93.043
2007-10-01	96.913
2008-01-01	105.073
2008-04-01	113.798
2008-07-01	102.898
2008-10-01	90.502
2009-01-01	89.875
2009-04-01	104.451
2009-07-01	115.174
2009-10-01	108.705
2010-01-01	108.880
2010-04-01	87.149
2010-07-01	91.760
2010-10-01	88.610
2011-01-01	89.935
2011-04-01	89.290
2011-07-01	80.222
2011-10-01	77.576
2012-01-01	72.852
2012-04-01	70.213
2012-07-01	67.268
2012-10-01	67.877
2013-01-01	64.218
2013-04-01	59.060
2013-07-01	59.747
2013-10-01	58.461
2014-01-01	57.301
2014-04-01	46.208
2014-07-01	38.933
2014-10-01	34.879
2015-01-01	29.791
2015-04-01	29.370