Quarter	Millions of US Dollars
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	198
1992-01-01	183
1992-04-01	196
1992-07-01	213
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	0
1996-04-01	0
1996-07-01	0
1996-10-01	0
1997-01-01	0
1997-04-01	0
1997-07-01	248
1997-10-01	231
1998-01-01	226
1998-04-01	216
1998-07-01	222
1998-10-01	264
1999-01-01	252
1999-04-01	248
1999-07-01	0
1999-10-01	0
2000-01-01	0
2000-04-01	0
2000-07-01	700
2000-10-01	700
2001-01-01	700
2001-04-01	917
2001-07-01	233
2001-10-01	855
2002-01-01	1150
2002-04-01	953
2002-07-01	947
2002-10-01	600
2003-01-01	1300
2003-04-01	1300
2003-07-01	1571
2003-10-01	1281
2004-01-01	289
2004-04-01	275
2004-07-01	271
2004-10-01	293
2005-01-01	281
2005-04-01	936
2005-07-01	962
2005-10-01	949
2006-01-01	966
2006-04-01	300
2006-07-01	0
2006-10-01	0
2007-01-01	0
2007-04-01	0
2007-07-01	0
2007-10-01	1589
2008-01-01	1632
2008-04-01	1631
2008-07-01	1572
2008-10-01	500
2009-01-01	500
2009-04-01	500
2009-07-01	500
2009-10-01	0
2010-01-01	0
2010-04-01	1000
2010-07-01	1000
2010-10-01	1000
2011-01-01	1000
2011-04-01	0
2011-07-01	0
2011-10-01	476
2012-01-01	476
2012-04-01	472
2012-07-01	1273
2012-10-01	2123
2013-01-01	2126
2013-04-01	3037
2013-07-01	4105
2013-10-01	4187
2014-01-01	4112
2014-04-01	5654
2014-07-01	3718
2014-10-01	3238
2015-01-01	3242
2015-04-01	807
2015-07-01	2360
2015-10-01	3546
2016-01-01	3562
2016-04-01	6473
2016-07-01	4946
2016-10-01	3744
2017-01-01	3775
2017-04-01	885
2017-07-01	1654
2017-10-01	1690
2018-01-01	1750
2018-04-01	3112