Year	Percent
1980-01-01	3.7585200000000000
1981-01-01	3.8317099999999997
1982-01-01	3.8941100000000000
1983-01-01	4.6086000000000000
1984-01-01	6.9597600000000000
1985-01-01	5.6784400000000000
1986-01-01	5.5623000000000000
1987-01-01	5.8638100000000000
1988-01-01	5.8470000000000000
1989-01-01	5.3499300000000005
1990-01-01	9.3405100000000000
1991-01-01	3.2746500000000000
1992-01-01	3.2773199999999996
1993-01-01	2.8615500000000000
1994-01-01	1.7260400000000002
1995-01-01	0.9023780000000000
1996-01-01	0.8263600000000000
1997-01-01	1.7711400000000002
1998-01-01	2.4152600000000000
1999-01-01	3.1950600000000000
2000-01-01	2.9284500000000000
2001-01-01	3.7807400000000000
2002-01-01	3.8338600000000000
2003-01-01	3.4653300000000002
2004-01-01	2.8358600000000000
2005-01-01	2.7261900000000003
2006-01-01	2.0980800000000000
2007-01-01	2.0567200000000000
2008-01-01	1.9724099999999998
2009-01-01	2.8337300000000000
2010-01-01	1.8668099999999999
2011-01-01	1.8160599999999998
2012-01-01	1.4676500000000000
2013-01-01	1.8943200000000000
2014-01-01	2.2080100000000000
2015-01-01	2.6125700000000003
2016-01-01	2.5120299999999998