Year	Percent
2000	26.96
2001	27.76
2002	28.37
2003	27.85
2004	28.79
2005	28.41
2006	28.41
2007	28.33
2008	25.76
2009	25.25
2010	24.39
2011	24.17
2012	23.44
2013	23.51
2014	23.42
2015	23.82
2016	23.33
2017	23.29