Year	Percent
1995	17.22
1996	17.22
1997	15.07
1998	15.74
1999	15.74
2000	16.73
2001	16.73
2002	16.36
2003	16.36
2004	18.33
2005	18.33
2006	16.18
2007	16.17
2008	16.98
2009	17.83
2010	16.39
2011	15.19
2013	14.42
2014	13.58
2015	12.92
2016	14.98