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	387
1993-10-01	294
1994-01-01	314
1994-04-01	158
1994-07-01	47
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	137
2001-07-01	232
2001-10-01	390
2002-01-01	375
2002-04-01	388
2002-07-01	280
2002-10-01	152
2003-01-01	232
2003-04-01	110
2003-07-01	647
2003-10-01	663
2004-01-01	695
2004-04-01	647
2004-07-01	25
2004-10-01	14
2005-01-01	92
2005-04-01	292
2005-07-01	274
2005-10-01	303
2006-01-01	262
2006-04-01	400
2006-07-01	457
2006-10-01	458
2007-01-01	968
2007-04-01	864
2007-07-01	885
2007-10-01	937
2008-01-01	513
2008-04-01	437
2008-07-01	417
2008-10-01	419
2009-01-01	378
2009-04-01	146
2009-07-01	110
2009-10-01	501
2010-01-01	1180
2010-04-01	1161
2010-07-01	1475
2010-10-01	1136
2011-01-01	1034
2011-04-01	1074
2011-07-01	931
2011-10-01	861
2012-01-01	595
2012-04-01	745
2012-07-01	612
2012-10-01	732
2013-01-01	396
2013-04-01	959
2013-07-01	895
2013-10-01	1136
2014-01-01	1419
2014-04-01	1746
2014-07-01	1736
2014-10-01	1880
2015-01-01	1607
2015-04-01	530
2015-07-01	796
2015-10-01	288
2016-01-01	270
2016-04-01	1257
2016-07-01	1058
2016-10-01	1852
2017-01-01	1859
2017-04-01	1049
2017-07-01	987
2017-10-01	917
2018-01-01	919
2018-04-01	876