Year	Percent
1998-01-01	61.092900000000000
1999-01-01	60.802400000000000
2000-01-01	62.600000000000000
2001-01-01	62.700000000000000
2002-01-01	60.589900000000000
2003-01-01	53.042300000000000
2004-01-01	58.251999999999995
2005-01-01	48.890700000000000
2006-01-01	44.277000000000000
2007-01-01	44.895700000000000
2008-01-01	53.793500000000000
2009-01-01	53.913700000000000
2010-01-01	58.104500000000000
2011-01-01	63.135400000000000
2012-01-01	57.909900000000000
2013-01-01	52.961800000000000
2014-01-01	61.961900000000000
2015-01-01	63.984400000000000
2016-01-01	62.951800000000000