Year	Percent
1996-01-01	38.491500000000000
1997-01-01	32.670200000000000
1998-01-01	24.193200000000000
1999-01-01	25.757300000000000
2000-01-01	31.466800000000000
2001-01-01	27.425000000000000
2002-01-01	19.029700000000000
2003-01-01	19.029700000000000
2004-01-01	19.757700000000000
2005-01-01	22.340900000000000
2006-01-01	24.474900000000000
2007-01-01	26.407900000000000
2008-01-01	25.445300000000000
2009-01-01	27.510700000000000
2010-01-01	23.696800000000000
2011-01-01	17.564500000000000
2012-01-01	15.020500000000000
2013-01-01	19.588700000000000
2014-01-01	20.284500000000000
2015-01-01	22.296999999999997
2016-01-01	20.399900000000000