Year	Percent
1986-01-01	3.3750000000000000
1987-01-01	2.5000000000000000
1988-01-01	2.3000000000000000
1989-01-01	1.0781500000000000
1990-01-01	0.9114820000000000
1991-01-01	0.9114820000000000
1992-01-01	8.1016000000000000
1993-01-01	7.8109699999999990
1994-01-01	6.7122699999999990
1995-01-01	6.0018600000000000
1996-01-01	7.1453500000000000
1997-01-01	6.9216500000000000
1998-01-01	7.0608699999999995
1999-01-01	6.9390199999999990
2000-01-01	5.7854000000000000
2001-01-01	7.9849800000000000
2002-01-01	7.0715300000000000
2003-01-01	6.8202100000000000
2004-01-01	6.3618200000000000
2005-01-01	4.6793500000000000
2006-01-01	3.6052400000000002
2007-01-01	3.7813400000000000
2008-01-01	6.5759600000000000
2009-01-01	6.3597600000000000
2010-01-01	6.0225000000000000
2011-01-01	5.7683300000000010
2012-01-01	4.9508300000000010
2013-01-01	4.8766700000000000
2014-01-01	4.8866700000000000
2015-01-01	4.1675000000000000