Year	Percent
1998-01-01	67.5
1999-01-01	65.4
2000-01-01	62.8
2001-01-01	63.9
2002-01-01	58.9
2003-01-01	45.4
2004-01-01	59.5
2005-01-01	63
2006-01-01	60
2007-01-01	50.7
2008-01-01	50.7
2009-01-01	50.7
2010-01-01	50.7