Year	Percent
1982-01-01	8.4127900000000000
1983-01-01	8.4949300000000000
1984-01-01	10.4302000000000000
1985-01-01	9.0450900000000000
1986-01-01	6.5843300000000005
1987-01-01	7.3820600000000010
1988-01-01	9.3533600000000000
1989-01-01	10.3341000000000000
1990-01-01	11.2374000000000000
1991-01-01	12.7273000000000000
1992-01-01	13.2002000000000000
1993-01-01	11.9643000000000000
1994-01-01	11.0910000000000000
1995-01-01	10.7160000000000000
1996-01-01	7.5900100000000000
1997-01-01	8.1704100000000000
1998-01-01	8.0826400000000000
1999-01-01	8.3672200000000000
2000-01-01	8.3213700000000000
2001-01-01	7.4929999999999990
2002-01-01	6.8990300000000010
2003-01-01	7.4120600000000000
2004-01-01	7.5330699999999995
2005-01-01	7.5490600000000010
2006-01-01	8.0892400000000000
2007-01-01	8.3990900000000000
2008-01-01	9.3154399999999990
2009-01-01	12.0802000000000000
2010-01-01	15.5137000000000000
2011-01-01	16.5843000000000000
2012-01-01	18.7081000000000000
2013-01-01	19.7256000000000000
2014-01-01	23.4132000000000000
2015-01-01	24.7868000000000000
2016-01-01	26.3088000000000000