Year	Percent
1980-01-01	8.560360000000001
1981-01-01	8.525380000000000
1982-01-01	8.672410000000001
1983-01-01	9.214200000000000
1984-01-01	8.999570000000000
1985-01-01	9.847170000000000
1986-01-01	9.732150000000000
1987-01-01	11.619100000000000
1988-01-01	10.142400000000000
1989-01-01	11.149200000000000
1990-01-01	11.237100000000000
1991-01-01	12.430500000000000
1992-01-01	13.637700000000000
1993-01-01	13.019800000000000
1994-01-01	12.040300000000000
1995-01-01	12.646200000000000
1996-01-01	12.902300000000000
1997-01-01	12.696700000000000
1998-01-01	18.458500000000000
1999-01-01	21.161700000000000
2000-01-01	20.408800000000000
2001-01-01	25.324100000000000
2002-01-01	25.889000000000000
2003-01-01	26.956900000000000
2004-01-01	23.345900000000000
2005-01-01	20.629600000000000
2006-01-01	21.605800000000000
2007-01-01	22.095500000000000
2008-01-01	24.522400000000000
2009-01-01	29.057200000000000
2010-01-01	26.322300000000000
2011-01-01	26.370800000000000
2012-01-01	27.234200000000000
2013-01-01	25.946100000000000
2014-01-01	27.622900000000000
2015-01-01	27.603300000000000
2016-01-01	27.868400000000000