Year	Percent
1984-01-01	8.4163100000000010
1985-01-01	10.0645000000000000
1986-01-01	10.7088000000000000
1987-01-01	6.9969300000000000
1988-01-01	5.3826600000000000
1989-01-01	6.0443300000000000
1990-01-01	4.4667699999999995
1991-01-01	3.5078199999999997
1992-01-01	3.8109800000000003
1993-01-01	2.9471700000000003
1994-01-01	2.2325400000000000
1995-01-01	2.2408600000000000
1996-01-01	2.6895000000000000
1997-01-01	3.4692800000000004
1998-01-01	3.3962600000000000
1999-01-01	3.3323099999999997
2000-01-01	2.9887300000000000
2001-01-01	3.2571600000000000
2002-01-01	2.8777100000000000
2003-01-01	3.2463599999999997
2004-01-01	3.1810099999999997
2005-01-01	4.0111700000000000
2006-01-01	5.2413700000000000
2007-01-01	5.6656400000000000
2008-01-01	5.5887500000000000
2009-01-01	5.8774100000000000
2010-01-01	5.5925699999999990
2011-01-01	5.0654500000000000
2012-01-01	4.8260200000000000
2013-01-01	4.6138500000000000
2014-01-01	4.7146000000000000
2015-01-01	4.7647400000000000
2016-01-01	5.3111300000000000
2017-01-01	4.9083000000000000