Quarter	Millions of US Dollars
1981-10-01	0
1982-01-01	0
1982-04-01	0
1982-07-01	0
1982-10-01	0
1983-01-01	0
1983-04-01	0
1983-07-01	0
1983-10-01	0
1984-01-01	0
1984-04-01	0
1984-07-01	0
1984-10-01	0
1985-01-01	0
1985-04-01	0
1985-07-01	0
1985-10-01	0
1986-01-01	0
1986-04-01	0
1986-07-01	0
1986-10-01	0
1987-01-01	0
1987-04-01	0
1987-07-01	0
1987-10-01	111
1988-01-01	110
1988-04-01	107
1988-07-01	104
1988-10-01	0
1989-01-01	0
1989-04-01	0
1989-07-01	0
1989-10-01	0
1990-01-01	0
1990-04-01	0
1990-07-01	0
1990-10-01	0
1991-01-01	150
1991-04-01	150
1991-07-01	150
1991-10-01	230
1992-01-01	275
1992-04-01	284
1992-07-01	292
1992-10-01	330
1993-01-01	218
1993-04-01	214
1993-07-01	217
1993-10-01	286
1994-01-01	200
1994-04-01	200
1994-07-01	200
1994-10-01	0
1995-01-01	0
1995-04-01	0
1995-07-01	0
1995-10-01	0
1996-01-01	125
1996-04-01	125
1996-07-01	289
1996-10-01	286
1997-01-01	174
1997-04-01	260
1997-07-01	347
1997-10-01	335
1998-01-01	377
1998-04-01	638
1998-07-01	762
1998-10-01	1031
1999-01-01	1249
1999-04-01	875
1999-07-01	587
1999-10-01	357
2000-01-01	155
2000-04-01	220
2000-07-01	220
2000-10-01	220
2001-01-01	259
2001-04-01	150
2001-07-01	190
2001-10-01	259
2002-01-01	107
2002-04-01	116
2002-07-01	75
2002-10-01	242
2003-01-01	334
2003-04-01	460
2003-07-01	504
2003-10-01	282
2004-01-01	192
2004-04-01	97
2004-07-01	176
2004-10-01	150
2005-01-01	150
2005-04-01	150
2005-07-01	0
2005-10-01	0
2006-01-01	40
2006-04-01	191
2006-07-01	625
2006-10-01	783
2007-01-01	1133
2007-04-01	984
2007-07-01	603
2007-10-01	533
2008-01-01	571
2008-04-01	1359
2008-07-01	1530
2008-10-01	1825
2009-01-01	2052
2009-04-01	1768
2009-07-01	2194
2009-10-01	2599
2010-01-01	4161
2010-04-01	5923
2010-07-01	5699
2010-10-01	5513
2011-01-01	5220
2011-04-01	4842
2011-07-01	6620
2011-10-01	7218
2012-01-01	5999
2012-04-01	4509
2012-07-01	2329
2012-10-01	1143
2013-01-01	530
2013-04-01	105
2013-07-01	500
2013-10-01	2747
2014-01-01	3342
2014-04-01	3479
2014-07-01	3159
2014-10-01	1112
2015-01-01	858
2015-04-01	993
2015-07-01	1101
2015-10-01	1073
2016-01-01	675
2016-04-01	530
2016-07-01	630
2016-10-01	745
2017-01-01	1497
2017-04-01	1922
2017-07-01	1816
2017-10-01	1532
2018-01-01	741
2018-04-01	706