Year	Percent
2005-01-01	59.0993343607420
2006-01-01	57.8999923981245
2007-01-01	57.5563066571206
2008-01-01	57.7146264320789
2009-01-01	57.2323171436625
2010-01-01	57.4725794093804
2011-01-01	57.1550351259100
2012-01-01	56.1457175669740
2013-01-01	56.1174527486002
2014-01-01	56.9460459638911
2015-01-01	56.6487954586448
2016-01-01	56.5984880674356
2017-01-01	57.0403749019242