Year	Percent
1999-01-01	5.700000000000000
2000-01-01	5.700000000000000
2001-01-01	5.700000000000000
2002-01-01	5.700000000000000
2003-01-01	5.700000000000000
2004-01-01	13.700000000000000
2005-01-01	12.000000000000000
2006-01-01	10.900000000000000
2007-01-01	6.000000000000000
2008-01-01	5.600000000000000
2009-01-01	7.200000000000000
2010-01-01	7.074540000000000
2011-01-01	7.323639999999999
2012-01-01	7.647639999999999
2013-01-01	8.077090000000000
2014-01-01	7.228089999999999
2015-01-01	7.312550000000000
2016-01-01	7.511120000000000