Year	Percent
1983-01-01	20.4738000000000000
1984-01-01	18.6381000000000000
1985-01-01	20.9419000000000000
1986-01-01	16.0385000000000000
1987-01-01	12.8494000000000000
1988-01-01	8.8430900000000000
1989-01-01	7.1898700000000000
1990-01-01	6.1705600000000000
1991-01-01	5.2635900000000000
1992-01-01	4.2024500000000000
1993-01-01	4.2218400000000000
1994-01-01	4.5117900000000000
1995-01-01	4.4975400000000000
1996-01-01	4.5871699999999995
1997-01-01	4.8158000000000000
1998-01-01	5.0482800000000000
1999-01-01	6.8282600000000000
2000-01-01	5.9393100000000000
2001-01-01	6.8679900000000000
2002-01-01	8.7322300000000000
2003-01-01	9.6962000000000000
2004-01-01	8.7053400000000000
2005-01-01	8.0020500000000000
2006-01-01	9.0103900000000000
2007-01-01	8.0612400000000000
2008-01-01	6.7545600000000010
2009-01-01	7.8166000000000000
2010-01-01	9.9909699999999990
2011-01-01	8.0874800000000010
2012-01-01	8.2160300000000000
2013-01-01	7.6166199999999990
2014-01-01	7.0222800000000000
2015-01-01	7.0831000000000000
2016-01-01	6.3725800000000000