Year	Percent
2001-01-01	10.200000000000000
2002-01-01	9.400000000000000
2003-01-01	9.000000000000000
2004-01-01	7.400000000000000
2005-01-01	6.600000000000000
2006-01-01	6.300000000000000
2007-01-01	7.200000000000000
2008-01-01	7.500000000000000
2009-01-01	7.700000000000000
2010-01-01	7.951969999999999
2011-01-01	9.036210000000000
2012-01-01	9.470620000000000
2013-01-01	9.500000000000000
2014-01-01	9.600000000000000
2015-01-01	9.300000000000000