Year	Percent
2000	7.54
2001	7.84
2002	12.55
2003	9.92
2004	8.53
2005	8.11
2006	8.27
2007	8.1
2008	8.22
2009	8.41
2010	8.64
2011	8.53
2012	8.43
2013	8.33
2014	8.05
2015	7.56
2016	7.21
2017	6.89
2018	4.54