Year	Percent
1998-01-01	6.600000000000000
1999-01-01	6.600000000000000
2000-01-01	6.400000000000000
2001-01-01	6.200000000000000
2002-01-01	6.300000000000000
2003-01-01	6.900000000000000
2004-01-01	6.800000000000000
2005-01-01	7.500000000000000
2006-01-01	9.100000000000000
2007-01-01	8.900000000000000
2008-01-01	8.500000000000000
2009-01-01	7.200000000000000
2010-01-01	7.300000000000000
2011-01-01	7.604019999999999