Year	Percent
1998-01-01	70.30
1999-01-01	75.00
2000-01-01	75.00
2001-01-01	59.20
2002-01-01	75.60
2003-01-01	59.80
2004-01-01	87.10
2005-01-01	97.40
2006-01-01	109.60
2007-01-01	111.80
2008-01-01	63.10
2009-01-01	59.80
2010-01-01	65.60
2011-01-01	63.30
2012-01-01	69.60
2013-01-01	71.50
2014-01-01	71.93
2015-01-01	78.60