Year	Percent
1980-01-01	4.3465700000000000
1981-01-01	4.5641000000000000
1982-01-01	4.5827800000000005
1983-01-01	5.4350200000000000
1984-01-01	4.6928600000000000
1985-01-01	4.0012600000000000
1986-01-01	4.8044199999999995
1987-01-01	8.5877100000000010
1988-01-01	9.4112400000000000
1989-01-01	8.7510400000000000
1990-01-01	8.9076600000000000
1991-01-01	12.7605000000000000
1992-01-01	14.0771000000000000
1993-01-01	14.4293000000000000
1994-01-01	12.6968000000000000
1995-01-01	10.9692000000000000
1996-01-01	9.7042300000000000
1997-01-01	8.8989000000000000
1998-01-01	8.1696100000000000
1999-01-01	8.4495899999999990
2000-01-01	9.7535500000000000
2001-01-01	7.5668500000000000
2002-01-01	6.9871700000000000
2003-01-01	7.0498100000000010
2004-01-01	5.3776600000000000
2005-01-01	4.3844199999999995
2006-01-01	3.7196800000000003
2007-01-01	3.3062099999999996
2008-01-01	2.4656599999999997
2009-01-01	2.6045500000000000
2010-01-01	2.1972900000000000
2011-01-01	1.4224700000000001
2012-01-01	1.2993100000000000
2013-01-01	0.9742799999999999
2014-01-01	0.9839020000000000
2015-01-01	0.5464120000000000
2016-01-01	0.5240090000000001