Year	Percent
1980-01-01	7.0119000000000000
1981-01-01	6.0408300000000010
1982-01-01	6.5881399999999990
1983-01-01	5.6585400000000000
1984-01-01	5.3861600000000000
1985-01-01	6.9501700000000000
1986-01-01	6.6755900000000000
1987-01-01	7.9902500000000000
1988-01-01	7.5629899999999990
1989-01-01	6.8388800000000005
1990-01-01	5.4960700000000000
1991-01-01	5.9201600000000000
1992-01-01	5.4719400000000000
1993-01-01	5.4851199999999990
1994-01-01	5.4921900000000000
1995-01-01	4.7265100000000000
1996-01-01	7.6503800000000000
1997-01-01	8.1191100000000010
1998-01-01	12.2274000000000000
1999-01-01	22.9155000000000000
2000-01-01	21.6649000000000000
2001-01-01	26.0583000000000000
2002-01-01	25.8155000000000000
2003-01-01	24.0856000000000000
2004-01-01	21.7460000000000000
2005-01-01	23.6609000000000000
2006-01-01	20.5191000000000000
2007-01-01	19.8493000000000000
2008-01-01	20.4592000000000000
2009-01-01	27.1309000000000000
2010-01-01	24.9239000000000000
2011-01-01	19.2776000000000000
2012-01-01	17.0149000000000000
2013-01-01	14.5772000000000000
2014-01-01	13.5915000000000000
2015-01-01	13.2137000000000000
2016-01-01	12.8133000000000000