Year	Percent
2001	75.30475
2002	79.13362
2003	79.93879
2004	80.89296
2005	82.36519
2006	82.62948
2007	83.04551
2008	82.99687
2009	82.73868
2010	82.73783
2011	83.07888
2012	83.36938
2013	82.89347
2015	84.80395