Year	Percent
2005-01-01	56.4128297109754
2006-01-01	55.0755421268761
2007-01-01	54.5561504125493
2008-01-01	54.7640911817367
2009-01-01	54.1660699712567
2010-01-01	54.3599423025785
2011-01-01	53.8388636822065
2012-01-01	52.7343873284624
2013-01-01	52.5997697298901
2014-01-01	53.4250800012631
2015-01-01	53.1541034591151
2016-01-01	53.0171548116842
2017-01-01	53.3280982676512