Year	Percent
2000	83.75807
2001	84.69067
2002	85.60941
2003	87.70973
2004	88.35255
2005	89.05848
2006	89.9579
2007	90.29045
2008	87.82082
2009	88.39707
2010	90.9133
2011	91.5084
2012	91.92164
2013	91.11385
2014	90.47546
2015	89.83692
2016	89.51299