Year	Percent
2000	10.36
2001	10.84
2002	9.33
2003	8.19
2004	8.94
2005	7.04
2006	5.41
2007	5.02
2008	4.84
2009	5.36
2010	5.08
2011	4.84
2012	4.61
2013	4.55
2014	4.87
2015	4.53
2016	4.57
2017	4.51