Year	Percent
1965-01-01	9.0899000000000000
1966-01-01	8.6007800000000000
1967-01-01	9.2830600000000000
1968-01-01	9.9866900000000000
1969-01-01	10.6199000000000000
1970-01-01	6.1252600000000000
1971-01-01	5.9637100000000000
1972-01-01	6.6119900000000000
1973-01-01	7.6877699999999995
1974-01-01	8.4190700000000000
1975-01-01	8.2757200000000000
1976-01-01	7.8208899999999995
1977-01-01	8.1710700000000000
1978-01-01	9.0598200000000000
1979-01-01	9.4503700000000000
1980-01-01	8.2636800000000000
1981-01-01	9.1714399999999990
1982-01-01	9.7123500000000000
1983-01-01	9.0022899999999990
1984-01-01	9.4440900000000000
1985-01-01	9.4574000000000000
1986-01-01	9.3616900000000000
1987-01-01	10.4464000000000000
1988-01-01	9.9919300000000000
1989-01-01	9.0035899999999990
1990-01-01	9.0647000000000000
1991-01-01	7.9261500000000000
1992-01-01	9.0307600000000000
1993-01-01	7.9273600000000000
1994-01-01	9.0741600000000010
1995-01-01	6.9601000000000000
1996-01-01	6.5178900000000000
1997-01-01	6.0817400000000000
1998-01-01	6.2023300000000000
1999-01-01	6.4995000000000000
2000-01-01	6.5931800000000000
2001-01-01	7.5565700000000000
2002-01-01	7.5932600000000010
2003-01-01	7.9416800000000000
2004-01-01	8.2863000000000000
2005-01-01	8.8935000000000000
2006-01-01	8.2343700000000000
2007-01-01	8.9872700000000000
2008-01-01	11.8096000000000000
2009-01-01	14.7478000000000000
2010-01-01	16.4606000000000000
2011-01-01	18.6330000000000000
2012-01-01	19.8168000000000000
2013-01-01	18.9806000000000000
2014-01-01	18.8262000000000000
2015-01-01	18.1052000000000000
2016-01-01	17.7121000000000000