Year	Percent
1993	9.59
1994	8.76
1995	9.27
1997	8.81
1998	9.62
1999	8.91
2000	8.15
2001	7.58
2002	8.38
2003	8.96
2004	9.37
2005	8.53
2006	8.56
2007	8.68
2008	9.04
2009	8.25
2010	6.4
2011	6.2
2012	5.4
2013	5.46
2014	5.33
2015	5.6
2016	4.37
2017	4.15