Year	Percent
1995	22.62
1996	22.62
1997	20.33
1998	22.37
1999	22.37
2000	21.4
2001	21.41
2002	20.82
2003	20.82
2004	24.16
2005	24.16
2006	23.88
2007	24.69
2008	26.06
2009	27.15
2010	26.59
2011	25.35
2013	24.17
2014	22.6
2015	22.02
2016	24.23