Year	Percent
2000	81.97374
2001	82.31418
2002	82.65463
2003	82.99507
2004	83.33552
2005	83.67596
2006	84.0164
2007	84.35685
2008	84.69729
2009	85.03774
2010	85.37818
2011	85.71863
2012	86.05907
2013	86.39952
2014	86.39952
2015	86.39952