Year	Percent
1980-01-01	5.2657099999999994
1981-01-01	5.3778100000000000
1982-01-01	5.4081700000000000
1983-01-01	5.3696800000000010
1984-01-01	5.7529100000000000
1985-01-01	6.4934300000000000
1986-01-01	7.3029500000000000
1987-01-01	7.1415300000000000
1988-01-01	6.8686600000000000
1989-01-01	6.8004200000000000
1990-01-01	6.4419500000000000
1991-01-01	6.0374200000000000
1992-01-01	3.5644000000000000
1993-01-01	3.3487000000000000
1994-01-01	3.1539700000000000
1995-01-01	1.8350900000000000
1996-01-01	1.4059400000000000
1997-01-01	2.9734300000000000
1998-01-01	2.2398500000000000
1999-01-01	3.4604800000000004
2000-01-01	5.3045599999999995
2001-01-01	4.6836000000000000
2002-01-01	4.6906500000000000
2003-01-01	4.7028300000000005
2004-01-01	5.5226100000000000
2005-01-01	5.4229600000000000
2006-01-01	5.7014400000000000
2007-01-01	5.6504199999999996
2008-01-01	4.5250400000000000
2009-01-01	4.9938300000000000
2010-01-01	4.4732800000000000
2011-01-01	5.1889800000000000
2012-01-01	4.9061699999999995
2013-01-01	5.2891200000000000
2014-01-01	6.9773500000000000
2015-01-01	8.2876000000000000
2016-01-01	9.3452300000000000