Year	Percent
2005-01-01	51.8116816591893
2006-01-01	52.3192688562598
2007-01-01	52.5681088031819
2008-01-01	52.5501833606456
2009-01-01	51.8779231229489
2010-01-01	52.0477815992203
2011-01-01	52.5081991594418
2012-01-01	53.1695734817203
2013-01-01	53.0432801075557
2014-01-01	53.0267581964351
2015-01-01	53.5358307679299
2016-01-01	53.9583758258698
2017-01-01	54.3335831639181