Quarter	Millions of US Dollars
2002-04-01	45
2002-07-01	170
2002-10-01	170
2003-01-01	170
2003-04-01	270
2003-07-01	270
2003-10-01	270
2004-01-01	270
2004-04-01	270
2004-07-01	270
2004-10-01	270
2005-01-01	270
2005-04-01	270
2005-07-01	270
2005-10-01	270
2006-01-01	270
2006-04-01	270
2006-07-01	270
2006-10-01	270
2007-01-01	156
2007-04-01	156
2007-07-01	156
2007-10-01	156
2008-01-01	156
2008-04-01	156
2008-07-01	156
2008-10-01	156
2009-01-01	156
2009-04-01	156
2009-07-01	156
2009-10-01	156
2010-01-01	156
2010-04-01	156
2010-07-01	156
2010-10-01	156
2011-01-01	156
2011-04-01	156
2011-07-01	156
2011-10-01	156
2012-01-01	156
2012-04-01	111
2012-07-01	100
2012-10-01	100
2013-01-01	100
2013-04-01	100
2013-07-01	100
2013-10-01	100
2014-01-01	100
2014-04-01	100
2014-07-01	100
2014-10-01	100
2015-01-01	100