Year	Percent
1986-01-01	9.471670000000000
1987-01-01	10.311700000000000
1988-01-01	9.227500000000000
1989-01-01	9.310830000000001
1990-01-01	8.808330000000000
1991-01-01	9.903330000000000
1992-01-01	10.607500000000000
1993-01-01	9.978330000000000
1994-01-01	11.049200000000000
1995-01-01	10.379200000000000
1996-01-01	10.842500000000000
1997-01-01	10.095800000000000
1998-01-01	9.655830000000000
1999-01-01	4.443860000000000
2000-01-01	7.510000000000000
2001-01-01	6.850000000000000
2002-01-01	7.197870000000000
2003-01-01	7.030000000000000
2004-01-01	7.280000000000000
2005-01-01	6.990000000000000
2006-01-01	6.286519999999999
2007-01-01	7.633769999999999
2008-01-01	7.600210000000001
2009-01-01	5.800060000000000
2010-01-01	5.191040000000000
2011-01-01	6.864789999999999
2012-01-01	6.412450000000000
2013-01-01	6.712839999999999
2014-01-01	5.962770000000000
2015-01-01	7.081620000000000
2016-01-01	7.527910000000000