Quarter	Millions of US Dollars
1997-01-01	229
2002-01-01	-3
2002-07-01	-3
2003-01-01	-5
2003-07-01	-5
2004-01-01	-5
2004-07-01	-5
2005-01-01	-5
2005-07-01	-5
2005-10-01	176
2006-01-01	-7
2006-07-01	-7
2007-01-01	-7
2007-07-01	-7
2008-01-01	-10
2008-07-01	-10
2009-01-01	-16
2009-07-01	228
2010-01-01	-16
2010-07-01	-16
2011-01-01	-21
2011-07-01	-21
2012-01-01	-21
2012-07-01	-21
2013-01-01	-231
2014-07-01	677
2015-10-01	123
2016-07-01	498
2018-01-01	598