Year	Percent
1980-01-01	9.8920700000000000
1981-01-01	13.2722000000000000
1982-01-01	11.8426000000000000
1983-01-01	14.9520000000000000
1984-01-01	13.3921000000000000
1985-01-01	10.7174000000000000
1986-01-01	9.8177800000000000
1987-01-01	10.9467000000000000
1988-01-01	10.4774000000000000
1989-01-01	11.5260000000000000
1990-01-01	7.5821500000000000
1991-01-01	7.3536899999999990
1992-01-01	5.5579400000000000
1993-01-01	10.0409000000000000
1994-01-01	10.3118000000000000
1995-01-01	8.9431600000000000
1996-01-01	7.9220000000000010
1997-01-01	7.2303200000000000
1998-01-01	9.6890300000000000
1999-01-01	5.7973000000000000
2000-01-01	6.5278000000000000
2001-01-01	8.5496300000000000
2002-01-01	7.1631899999999990
2003-01-01	6.6386400000000000
2004-01-01	6.7616800000000000
2005-01-01	9.4468100000000010
2006-01-01	9.4994000000000000
2007-01-01	8.6293700000000000
2008-01-01	7.7222000000000000
2009-01-01	11.0515000000000000
2010-01-01	9.1885100000000000
2011-01-01	9.2227800000000000
2012-01-01	9.0001100000000010
2013-01-01	8.1017900000000000
2014-01-01	8.4964800000000000
2015-01-01	7.3767900000000000
2016-01-01	6.7473600000000005