Year	Percent
2005	64.34849
2006	63.61694
2007	63.857
2008	63.93785
2009	65.02461
2010	69.1819
2011	67.93753
2012	72.18123
2013	72.92186
2014	73.47147
2015	71.61003
2016	71.34553