Year	Percent
1989-01-01	26.344300000000000
1990-01-01	24.677000000000000
1991-01-01	23.437300000000000
1992-01-01	21.110800000000000
1993-01-01	21.526100000000000
1994-01-01	22.013400000000000
1995-01-01	21.399300000000000
1996-01-01	19.213400000000000
1997-01-01	20.600900000000000
1998-01-01	21.108400000000000
1999-01-01	18.411800000000000
2000-01-01	19.171900000000000
2001-01-01	18.410999999999998
2002-01-01	20.682900000000000
2003-01-01	19.898400000000000
2004-01-01	19.518300000000000
2005-01-01	15.960100000000000
2006-01-01	16.434200000000000
2007-01-01	15.891200000000000
2008-01-01	14.645600000000000
2009-01-01	15.173100000000000
2010-01-01	15.236700000000000
2011-01-01	12.405600000000000
2012-01-01	13.871100000000000
2013-01-01	15.059700000000000
2014-01-01	14.530600000000000
2015-01-01	16.724400000000000
2016-01-01	17.396700000000000