Year	Percent
1996-01-01	71.494100000000000
1997-01-01	60.156000000000006
1998-01-01	57.272700000000000
1999-01-01	56.537500000000000
2000-01-01	57.567600000000000
2001-01-01	59.183100000000000
2002-01-01	47.569600000000000
2003-01-01	52.528999999999996
2004-01-01	47.613500000000000
2005-01-01	43.384500000000000
2006-01-01	40.224400000000000
2007-01-01	43.353800000000000
2008-01-01	29.383500000000000
2009-01-01	25.085100000000000
2010-01-01	22.866900000000000
2011-01-01	20.898400000000000
2012-01-01	19.987700000000000
2013-01-01	19.505600000000000
2014-01-01	20.756000000000000
2015-01-01	22.294400000000000
2016-01-01	24.251200000000000