Quarter	Millions of US Dollars
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	54
1987-10-01	63
1988-01-01	60
1988-04-01	55
1988-07-01	0
1988-10-01	0
1989-01-01	0
1989-04-01	46
1989-07-01	46
1989-10-01	46
1990-01-01	46
1990-04-01	0
1990-07-01	0
1990-10-01	0
1991-01-01	0
1991-04-01	83
1991-07-01	90
1991-10-01	99
1992-01-01	91
1992-04-01	0
1992-07-01	0
1992-10-01	93
1993-01-01	93
1993-04-01	239
1993-07-01	419
1993-10-01	349
1994-01-01	368
1994-04-01	212
1994-07-01	70
1994-10-01	46
1995-01-01	32
1995-04-01	22
1995-07-01	22
1995-10-01	12
1996-01-01	12
1996-04-01	18
1996-07-01	5
1996-10-01	2
1997-01-01	22
1997-04-01	22
1997-07-01	88
1997-10-01	82
1998-01-01	78
1998-04-01	82
1998-07-01	8
1998-10-01	8
1999-01-01	5
1999-04-01	15
1999-07-01	15
1999-10-01	15
2000-01-01	15
2000-04-01	20
2000-07-01	75
2000-10-01	75
2001-01-01	75
2001-04-01	70
2001-07-01	220
2001-10-01	240
2002-01-01	225
2002-04-01	220
2002-07-01	5
2002-10-01	0
2003-01-01	0
2003-04-01	10
2003-07-01	20
2003-10-01	20
2004-01-01	30
2004-04-01	20
2004-07-01	0
2004-10-01	14
2005-01-01	34
2005-04-01	14
2005-07-01	34
2005-10-01	20
2006-01-01	20
2006-04-01	345
2006-07-01	355
2006-10-01	335
2007-01-01	835
2007-04-01	760
2007-07-01	750
2007-10-01	825
2008-01-01	350
2008-04-01	305
2008-07-01	277
2008-10-01	277
2009-01-01	289
2009-04-01	620
2009-07-01	576
2009-10-01	980
2010-01-01	1630
2010-04-01	1113
2010-07-01	1413
2010-10-01	1013
2011-01-01	880
2011-04-01	1527
2011-07-01	1227
2011-10-01	1227
2012-01-01	1157
2012-04-01	497
2012-07-01	497
2012-10-01	515
2013-01-01	18
2013-04-01	768
2013-07-01	768
2013-10-01	1160
2014-01-01	1260
2014-04-01	1588
2014-07-01	1636
2014-10-01	1729
2015-01-01	1629
2015-04-01	551
2015-07-01	503
2015-10-01	840
2016-01-01	898
2016-04-01	1545
2016-07-01	1486
2016-10-01	1307
2017-01-01	1831
2017-04-01	1353
2017-07-01	1357
2017-10-01	1440
2018-01-01	919
2018-04-01	972