Year	Percent
2000	83.46494
2001	80.7101
2002	82.47619
2003	82.70502
2004	82.30179
2005	82.64045
2006	81.63808
2007	83.24039
2008	83.80517
2009	83.4784
2010	82.98773
2011	82.75825
2012	82.31146
2013	83.09367
2014	83.61965
2015	82.83015
2016	82.15706
2017	82.38783