Year	Percent
1995	26.1
1996	27.2
1997	28.8
1998	29.3
1999	28.1
2000	26.3
2001	24.7
2002	20.87
2003	19.95
2004	20.71
2005	17.83
2006	22.94
2007	21.12
2008	22.57
2009	21.96
2010	21.03
2011	20.79
2012	21.02
2013	22.81
2016	17.6