Year	Percent
1980-01-01	1.4390700000000000
1981-01-01	1.5694100000000000
1982-01-01	2.0221000000000000
1983-01-01	2.5252200000000000
1984-01-01	3.0676400000000004
1985-01-01	4.5450900000000000
1986-01-01	4.8384800000000010
1987-01-01	6.0516900000000000
1988-01-01	5.9570099999999995
1989-01-01	8.6179200000000000
1990-01-01	10.0320000000000000
1991-01-01	10.0470000000000000
1992-01-01	9.0961800000000000
1993-01-01	7.4952500000000000
1994-01-01	7.0677100000000010
1995-01-01	6.3210800000000000
1996-01-01	6.9342600000000010
1997-01-01	7.0711500000000000
1998-01-01	7.7090800000000000
1999-01-01	7.2508000000000000
2000-01-01	5.7490800000000000
2001-01-01	5.8081000000000000
2002-01-01	5.9540400000000000
2003-01-01	5.9814300000000005
2004-01-01	6.0159900000000000
2005-01-01	5.5715699999999995
2006-01-01	6.7910000000000000
2007-01-01	7.6465100000000000
2008-01-01	7.5839399999999990
2009-01-01	7.1506399999999990
2010-01-01	6.6366700000000000
2011-01-01	5.9084100000000000
2012-01-01	6.0427000000000000
2013-01-01	7.5863900000000000
2014-01-01	8.4653500000000000
2015-01-01	9.9400600000000000
2016-01-01	9.4256600000000000