Year	Percent
2000	90.50571
2001	90.44176
2002	90.3778
2003	90.31384
2004	90.24988
2005	90.18593
2006	90.12197
2007	90.05801
2008	89.99405
2009	89.9301
2010	89.86614
2011	89.80218
2012	89.73822
2013	89.73822
2014	89.73822
2015	89.73822
2016	89.73822