Year	Percent
1999-01-01	6.300000000000000
2000-01-01	5.400000000000000
2001-01-01	5.200000000000000
2002-01-01	5.200000000000000
2003-01-01	5.700000000000000
2004-01-01	5.200000000000000
2005-01-01	5.400000000000000
2006-01-01	6.000000000000000
2007-01-01	5.700000000000000
2008-01-01	5.500000000000000
2009-01-01	6.100000000000000
2010-01-01	6.486400000000000
2011-01-01	6.491720000000000
2012-01-01	6.874569999999999
2013-01-01	7.208620000000000
2014-01-01	7.302789999999999
2015-01-01	7.524660000000001
2016-01-01	7.257310000000000