Year	Percent
1980-01-01	8.1746000000000000
1981-01-01	8.4381899999999990
1982-01-01	8.5201800000000000
1983-01-01	10.1826000000000000
1984-01-01	6.5191099999999995
1985-01-01	5.9095600000000000
1986-01-01	7.0148300000000000
1987-01-01	10.5462000000000000
1988-01-01	8.9837400000000000
1989-01-01	8.1402600000000010
1990-01-01	7.5607899999999990
1991-01-01	9.0529400000000000
1992-01-01	12.5066000000000000
1993-01-01	12.4773000000000000
1994-01-01	12.8025000000000000
1995-01-01	11.2986000000000000
1996-01-01	12.5259000000000000
1997-01-01	12.9342000000000000
1998-01-01	11.6769000000000000
1999-01-01	8.6960100000000010
2000-01-01	8.9473600000000000
2001-01-01	7.4496000000000000
2002-01-01	12.8033000000000000
2003-01-01	13.4309000000000000
2004-01-01	9.2813000000000000
2005-01-01	10.6647000000000000
2006-01-01	9.7177700000000000
2007-01-01	12.6255000000000000
2008-01-01	11.0509999999999980
2009-01-01	15.7957000000000000
2010-01-01	16.8570000000000000
2011-01-01	17.8964000000000000
2012-01-01	22.6440000000000020
2013-01-01	21.7783000000000000
2014-01-01	24.1136000000000000
2015-01-01	28.1494000000000000
2016-01-01	28.5722000000000000