Year	Percent
1996-01-01	52.691200000000000
1997-01-01	37.268200000000000
1998-01-01	45.502500000000000
1999-01-01	44.221000000000004
2000-01-01	56.822300000000000
2001-01-01	58.422300000000000
2002-01-01	63.958400000000000
2003-01-01	66.341900000000000
2004-01-01	61.668600000000000
2005-01-01	54.433000000000000
2006-01-01	54.881300000000000
2007-01-01	51.497500000000000
2008-01-01	54.858800000000000
2009-01-01	61.263400000000000
2010-01-01	63.319800000000000
2011-01-01	65.040300000000000
2012-01-01	62.476700000000000
2013-01-01	58.705100000000000
2014-01-01	55.611600000000000