Year	Percent
2004	57.42459
2006	64.03664
2007	69.46887
2008	71.66752
2009	57.23704
2010	67.22956
2011	68.09471
2012	74.01124
2013	77.23456
2014	80.19374
2015	85.01027
2016	88.73115
2017	94.29651