Year	Percent
1995	13.15
1996	13.83
1997	12.41
1998	12.03
1999	11.75
2000	11.11
2001	10.26
2002	9.63
2003	9.58
2004	9.65
2005	8.52
2006	9.02
2007	8.83
2008	8.07
2009	7.92
2010	7.69
2011	7.32
2012	8.49
2013	8.32
2014	8.17
2015	8.18
2016	7.67