Year	Percent
1995	23.2554
1996	21.42004
1997	20.42271
1998	20.10886
1999	19.69795
2000	18.46662
2001	17.23454
2002	17.07473
2003	17.63927
2004	17.24557
2005	17.96072
2006	16.75461
2007	16.7158
2008	16.40638
2009	15.48444
2010	14.99047
2011	15.50155
2012	14.97135
2013	15.92241
2014	16.69956
2015	17.59772
2016	17.44623