Year	Percent
1996	12.92
1997	10.08
1998	11.56
1999	9.03
2000	11.02
2001	9.53
2002	8.82
2003	10.3
2004	10.44
2005	9.25
2006	8.4
2010	7.8
2011	9.4
2012	9.8
2013	10.1
2014	10.3
2015	9.1