Quarter	Millions of US Dollars
1987-01-01	0
1987-04-01	0
1987-07-01	0
1987-10-01	0
1988-01-01	0
1988-04-01	0
1988-07-01	0
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	0
1991-04-01	0
1991-07-01	0
1991-10-01	0
1992-01-01	0
1992-04-01	0
1992-07-01	0
1992-10-01	0
1993-01-01	0
1993-04-01	0
1993-07-01	0
1993-10-01	0
1994-01-01	0
1994-04-01	0
1994-07-01	0
1994-10-01	0
1995-01-01	0
1995-04-01	0
1995-07-01	0
1995-10-01	0
1996-01-01	91
1996-04-01	97
1996-07-01	88
1996-10-01	86
1997-01-01	0
1997-04-01	0
1997-07-01	0
1997-10-01	0
1998-01-01	0
1998-04-01	0
1998-07-01	0
1998-10-01	0
1999-01-01	0
1999-04-01	0
1999-07-01	0
1999-10-01	0
2000-01-01	0
2000-04-01	0
2000-07-01	0
2000-10-01	0
2001-01-01	2
2001-04-01	2
2001-07-01	2
2001-10-01	2
2002-01-01	0
2002-04-01	0
2002-07-01	0
2002-10-01	0
2003-01-01	0
2003-04-01	0
2003-07-01	0
2003-10-01	0
2004-01-01	0
2004-04-01	2
2004-07-01	2
2004-10-01	2
2005-01-01	2
2005-04-01	0
2005-07-01	0
2005-10-01	293
2006-01-01	285
2006-04-01	297
2006-07-01	298
2006-10-01	0
2007-01-01	0
2007-04-01	0
2007-07-01	0
2007-10-01	0
2008-01-01	2512
2008-04-01	3324
2008-07-01	12674
2008-10-01	11784
2009-01-01	14012
2009-04-01	7848
2009-07-01	13666
2009-10-01	6198
2010-01-01	10313
2010-04-01	5858
2010-07-01	9863
2010-10-01	7056
2011-01-01	670
2011-04-01	652
2011-07-01	3352
2011-10-01	10313
2012-01-01	12324
2012-04-01	8718
2012-07-01	8952
2012-10-01	16078
2013-01-01	9968
2013-04-01	13275
2013-07-01	16015
2013-10-01	1647
2014-01-01	2394
2014-04-01	12334
2014-07-01	11203
2014-10-01	0
2015-01-01	0
2015-04-01	2781
2015-07-01	14365
2015-10-01	6386
2016-01-01	5810
2016-04-01	5665
2016-07-01	0
2016-10-01	1375
2017-01-01	0
2017-04-01	3015
2017-07-01	10768
2017-10-01	7976
2018-01-01	8191
2018-04-01	12852