Year	Percent
2005	18.4251
2006	18.08266
2007	19.07483
2008	18.52395
2009	17.12958
2010	16.86569
2011	16.99965
2012	16.41665
2013	15.66896
2014	16.23528
2015	16.83974
2016	16.8355