Quarter	Millions of US Dollars
1997-07-01	200
1997-10-01	200
1998-01-01	200
1998-04-01	200
1998-07-01	200
1998-10-01	200
1999-01-01	200
1999-04-01	200
1999-07-01	200
1999-10-01	200
2000-01-01	200
2000-04-01	200
2000-07-01	200
2000-10-01	200
2001-01-01	200
2001-04-01	200
2001-07-01	200
2001-10-01	200
2002-01-01	200
2002-04-01	200
2002-07-01	200
2002-10-01	200
2003-01-01	200
2003-04-01	200
2003-07-01	200
2003-10-01	200
2004-01-01	200
2004-04-01	200
2006-10-01	250
2007-01-01	681
2007-04-01	677
2007-07-01	675
2007-10-01	673
2008-01-01	672
2008-04-01	669
2008-07-01	665
2008-10-01	665
2009-01-01	614
2009-04-01	613
2009-07-01	613
2009-10-01	613
2010-01-01	610
2010-04-01	609
2010-07-01	608
2010-10-01	890
2011-01-01	929
2011-04-01	929
2011-07-01	929
2011-10-01	927
2012-01-01	779
2012-04-01	574
2012-07-01	574
2012-10-01	1124
2013-01-01	1124
2013-04-01	1124
2013-07-01	1124
2013-10-01	874
2014-01-01	874
2014-04-01	874
2014-07-01	874
2014-10-01	874
2015-01-01	874
2015-04-01	874
2015-07-01	874
2015-10-01	615
2016-01-01	575
2016-04-01	945
2016-07-01	946
2016-10-01	946
2017-01-01	713
2017-04-01	713
2017-07-01	712
2017-10-01	712
2018-01-01	712
2018-04-01	712