Year	Percent
1995	85.60361
1996	85.34478
1997	86.09693
1998	86.72773
1999	86.595
2000	86.60373
2001	86.94042
2002	86.64792
2003	87.21447
2004	86.97109
2005	86.41919
2006	86.54367
2007	86.83195
2008	87.32329
2009	86.9772
2010	86.66212
2011	87.10571
2012	86.98703
2013	86.80642
2014	87.32153
2015	87.58349
2016	87.84494
2017	87.79172