Year	Percent
1995	75.34985
1996	72.3011
1997	82.07306
1998	84.04779
1999	74.63949
2000	64.87741
2001	65.30505
2002	65.77213
2003	65.88243
2004	69.39452
2005	71.01071
2006	73.63287
2007	72.06998
2008	70.72521
2009	55.84493
2010	68.72192
2011	80.81022
2012	84.4389
2013	81.49142
2014	79.74295
2015	74.60395
2016	75.12149
2017	73.54658