Year	Percent
1983-01-01	9.121760000000000
1984-01-01	8.245000000000000
1985-01-01	9.205639999999999
1986-01-01	14.797100000000000
1987-01-01	13.827700000000000
1988-01-01	7.597620000000000
1989-01-01	9.722520000000000
1990-01-01	11.418400000000000
1991-01-01	12.286000000000000
1992-01-01	14.526300000000000
1993-01-01	15.069600000000000
1994-01-01	17.399500000000000
1995-01-01	18.213500000000000
1996-01-01	34.213100000000000
1997-01-01	30.364100000000000
1998-01-01	33.187600000000000
1999-01-01	45.816400000000000
2000-01-01	47.080800000000000
2001-01-01	51.145600000000000
2002-01-01	40.516800000000000
2003-01-01	36.410200000000000
2004-01-01	33.496800000000000
2005-01-01	43.925300000000000
2006-01-01	45.611800000000000
2007-01-01	56.481600000000000
2008-01-01	55.217300000000000
2009-01-01	42.324800000000000
2010-01-01	46.575300000000000
2011-01-01	39.721500000000000
2012-01-01	44.307200000000000
2013-01-01	47.527500000000000
2014-01-01	47.969300000000000
2015-01-01	37.846700000000000
2016-01-01	41.629700000000000