Year	Percent
2000	80.81867
2001	76.17761
2002	80.31175
2003	80.44974
2004	80.53443
2005	80.02448
2006	79.64742
2007	81.38389
2008	83.7362
2009	84.19249
2010	83.88874
2011	84.02323
2012	84.20538
2013	84.74413
2014	85.55655
2015	84.92645
2016	84.49104
2017	84.38168