Year	Percent
1991-01-01	2.2000000000000000
1992-01-01	2.1120000000000000
1993-01-01	2.2260000000000000
1994-01-01	2.8528599999999997
1995-01-01	1.5600900000000000
1996-01-01	2.4060700000000000
1997-01-01	2.1698800000000000
1998-01-01	1.8758700000000001
1999-01-01	1.9924400000000002
2000-01-01	1.2962700000000000
2001-01-01	1.8145500000000000
2002-01-01	1.8954300000000000
2003-01-01	2.3132400000000000
2004-01-01	2.1282099999999997
2005-01-01	3.0030400000000000
2006-01-01	2.7538700000000000
2007-01-01	2.7478900000000000
2008-01-01	1.6649400000000000
2009-01-01	2.7585000000000000
2010-01-01	5.4719600000000000
2011-01-01	5.9875000000000000
2012-01-01	6.9090700000000000
2013-01-01	6.8730400000000000
2014-01-01	6.6063800000000010
2015-01-01	6.9482600000000000