Year	Percent
2000	21.59
2001	22.6
2002	20.86
2003	19.57
2004	19.75
2005	16
2006	13.14
2007	12.68
2008	12.67
2009	13.49
2010	13.63
2011	13.69
2012	13.16
2013	12.6
2014	12.15
2015	11.66
2016	11.23
2017	11.12