Year	Percent
1999-01-01	37.392500000000000
2000-01-01	39.485200000000000
2001-01-01	41.943999999999996
2002-01-01	43.863600000000000
2003-01-01	48.871100000000000
2004-01-01	51.266600000000000
2005-01-01	49.309400000000000
2006-01-01	60.803200000000000
2007-01-01	58.283100000000000
2008-01-01	45.981200000000000
2009-01-01	66.841300000000000
2010-01-01	62.860400000000000
2011-01-01	58.143200000000000
2012-01-01	59.196000000000005
2013-01-01	57.942300000000000
2014-01-01	60.722200000000000
2015-01-01	69.667100000000000
2016-01-01	64.995900000000000