Year	Percent
1995	78.15075
1996	78.65213
1997	78.95745
1998	80.18035
1999	81.07044
2001	86.94694
2002	86.59956
2003	86.78915
2004	87.13286
2005	87.54542
2006	88.52864
2007	88.9444
2009	89.22332
2010	89.2643
2015	88.10949
2016	89.44208