Year	Percent
2005-01-01	57.2155964271837
2006-01-01	57.9863508427112
2007-01-01	57.9202180445084
2008-01-01	57.6157856808251
2009-01-01	56.6802172786923
2010-01-01	56.4974781692165
2011-01-01	56.6625665122700
2012-01-01	57.4549935249386
2013-01-01	57.3136697725193
2014-01-01	56.8861398896491
2015-01-01	57.2142203278072
2016-01-01	57.3721223947245
2017-01-01	57.3090230054105