Year	Percent
1995	76.75386
1996	77.55917
1997	79.89429
1998	77.4803
1999	78.28297
2000	79.48276
2001	79.2961
2002	78.75739
2003	83.92258
2004	84.14629
2005	81.26527
2006	81.3511
2007	83.19379
2008	84.3671
2009	85.03932
2010	84.83787
2011	85.6031
2012	84.81639
2013	84.4636
2014	84.21091
2015	84.26143
2016	85.28419
2017	85.51238