Quarter	Billions of US Dollars
1987-01-01	0.110
1987-04-01	0.139
1987-07-01	0.130
1987-10-01	0.400
1988-01-01	0.374
1988-04-01	0.291
1988-07-01	0.287
1988-10-01	0.109
1989-01-01	0.151
1989-04-01	0.062
1989-07-01	0.114
1989-10-01	0.152
1990-01-01	0.207
1990-04-01	0.305
1990-07-01	0.666
1990-10-01	0.490
1991-01-01	0.416
1991-04-01	0.350
1991-07-01	0.459
1991-10-01	0.208
1992-01-01	0.197
1992-04-01	0.104
1992-07-01	0.194
1992-10-01	0.052
1993-01-01	0.121
1993-04-01	0.179
1993-07-01	0.209
1993-10-01	0.163
1994-01-01	0.092
1994-04-01	0.146
1994-07-01	0.173
1994-10-01	0.192
1995-01-01	0.594
1995-04-01	0.406
1995-07-01	0.336
1995-10-01	0.421
1996-01-01	2.013
1996-04-01	2.018
1996-07-01	1.949
1996-10-01	1.744
1997-01-01	2.925
1997-04-01	4.624
1997-07-01	6.340
1997-10-01	6.526
1998-01-01	7.436
1998-04-01	8.124
1998-07-01	11.684
1998-10-01	11.741
1999-01-01	15.952
1999-04-01	16.736
1999-07-01	16.819
1999-10-01	18.985
2000-01-01	19.159
2000-04-01	21.948
2000-07-01	19.357
2000-10-01	23.204
2001-01-01	24.935
2001-04-01	27.959
2001-07-01	26.571
2001-10-01	29.851
2002-01-01	31.234
2002-04-01	33.493
2002-07-01	32.026
2002-10-01	34.081
2003-01-01	39.051
2003-04-01	43.814
2003-07-01	40.709
2003-10-01	44.100
2004-01-01	51.875
2004-04-01	51.301
2004-07-01	57.627
2004-10-01	74.477
2005-01-01	76.966
2005-04-01	74.591
2005-07-01	79.754
2005-10-01	89.193
2006-01-01	94.195
2006-04-01	94.747
2006-07-01	102.378
2006-10-01	114.899
2007-01-01	136.176
2007-04-01	135.964
2007-07-01	148.648
2007-10-01	140.981
2008-01-01	154.695
2008-04-01	163.762
2008-07-01	151.647
2008-10-01	123.068
2009-01-01	109.895
2009-04-01	104.052
2009-07-01	113.896
2009-10-01	99.200
2010-01-01	87.781
2010-04-01	80.368
2010-07-01	81.997
2010-10-01	79.827
2011-01-01	55.720
2011-04-01	50.617
2011-07-01	40.698
2011-10-01	40.474
2012-01-01	75.961
2012-04-01	82.971
2012-07-01	72.176
2012-10-01	77.019
2013-01-01	71.084
2013-04-01	65.713
2013-07-01	66.503
2013-10-01	61.889
2014-01-01	27.105
2014-04-01	27.082
2014-07-01	28.084
2014-10-01	28.530
2015-01-01	26.247
2015-04-01	26.936