Year	Percent
2000	12.7
2001	11.5
2002	10.4
2003	9.24
2004	8
2005	7.3
2006	6.33
2007	5.28
2008	4.95
2009	6.58
2010	6.91
2011	6.45
2012	6.09
2013	5.95
2014	5.84
2015	5.87
2016	6
2017	5.9