Year	Percent
1999-01-01	13.0000000000000000
2000-01-01	13.0000000000000000
2001-01-01	13.0000000000000000
2002-01-01	13.0000000000000000
2003-01-01	13.0000000000000000
2004-01-01	6.5000000000000000
2005-01-01	7.4000000000000000
2006-01-01	5.9000000000000000
2007-01-01	5.9000000000000000
2008-01-01	5.5000000000000000
2009-01-01	5.8000000000000000
2010-01-01	7.0154700000000000
2011-01-01	7.0887199999999995
2012-01-01	7.7519800000000005
2013-01-01	8.9479500000000000
2014-01-01	9.0496100000000010
2015-01-01	7.2165800000000000
2016-01-01	5.4275800000000000