Year	Percent
1999-01-01	5.200000000000000
2000-01-01	5.200000000000000
2001-01-01	5.200000000000000
2002-01-01	5.200000000000000
2003-01-01	3.800000000000000
2004-01-01	4.000000000000000
2005-01-01	4.400000000000000
2006-01-01	5.100000000000000
2007-01-01	5.700000000000000
2008-01-01	6.000000000000000
2009-01-01	5.600000000000000
2010-01-01	6.100000000000000
2011-01-01	6.400000000000000
2012-01-01	6.500000000000000
2013-01-01	6.700000000000000
2014-01-01	7.199250000000000
2015-01-01	8.437489999999999
2016-01-01	8.100300000000000