Year	Percent
1996	4.54
1998	6.16
1999	6.65
2000	7.39
2001	9.39
2002	7.8
2003	7.02
2004	6.36
2005	6.42
2006	7.11
2007	7.02
2008	6.33
2009	6.66
2010	6.03
2011	6.08
2012	4.98
2013	5.38
2014	5.54
2015	5.06
2016	4.23
2017	3.38