Year	Percent
2000	90.03187
2001	89.07749
2002	89.9243
2003	90.10088
2004	89.7587
2005	90.05681
2006	90.67724
2007	91.17176
2008	91.05421
2009	90.70733
2010	90.45202
2011	90.94022
2012	91.09851
2013	90.51892
2014	90.11918
2015	90.29197
2016	90.46527
2017	90.44541