Year	Percent
1996-01-01	53.649600000000000
1997-01-01	50.121300000000000
1998-01-01	51.063800000000000
1999-01-01	53.693200000000000
2000-01-01	53.486600000000000
2001-01-01	59.210500000000000
2002-01-01	58.301800000000000
2003-01-01	56.129000000000000
2004-01-01	61.038999999999994
2005-01-01	57.777800000000000
2006-01-01	57.378000000000000
2007-01-01	57.909900000000000
2008-01-01	53.989900000000000
2009-01-01	50.801800000000000
2010-01-01	47.467400000000000
2011-01-01	48.916800000000000
2012-01-01	49.373800000000000
2013-01-01	50.295200000000000
2014-01-01	51.106600000000000