Quarter	Millions of US Dollars
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	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	250
1995-07-01	250
1995-10-01	250
1996-01-01	250
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	372
2001-01-01	0
2001-04-01	0
2001-07-01	0
2001-10-01	0
2002-01-01	0
2002-04-01	0
2002-07-01	76
2002-10-01	80
2003-01-01	84
2003-04-01	659
2003-07-01	583
2003-10-01	631
2004-01-01	611
2004-04-01	0
2004-07-01	0
2004-10-01	1498
2005-01-01	1426
2005-04-01	2080
2005-07-01	2075
2005-10-01	850
2006-01-01	850
2006-04-01	100
2006-07-01	100
2006-10-01	0
2007-01-01	0
2007-04-01	0
2007-07-01	0
2007-10-01	0
2008-01-01	791
2008-04-01	1262
2008-07-01	2104
2008-10-01	2137
2009-01-01	1358
2009-04-01	903
2009-07-01	1799
2009-10-01	1765
2010-01-01	1669
2010-04-01	2793
2010-07-01	1365
2010-10-01	2672
2011-01-01	2841
2011-04-01	1445
2011-07-01	1936
2011-10-01	1875
2012-01-01	3829
2012-04-01	3869
2012-07-01	3390
2012-10-01	2064
2013-01-01	1438
2013-04-01	2071
2013-07-01	4634
2013-10-01	4734
2014-01-01	4860
2014-04-01	4004
2014-07-01	1500
2014-10-01	1500
2015-01-01	740
2015-04-01	1001
2015-07-01	2084
2015-10-01	2031
2016-01-01	1347
2016-04-01	1782
2016-07-01	1764
2016-10-01	1883
2017-01-01	3167
2017-04-01	4326
2017-07-01	3243
2017-10-01	3049
2018-01-01	4080
2018-04-01	3371