Year	%
2000	18.152723582855568
2001	17.862357094149406
2002	17.655064169053908
2003	17.514366735188176
2004	17.373049610642568
2005	17.288606237717982
2006	17.212436020166148
2007	17.196004593395376
2008	17.122281897982635
2009	17.10128671857562
2010	17.09229442317518
2011	17.138761158554605
2012	17.196574249715834
2013	17.2239415393978
2014	17.30602654028959
2015	17.357219552448644
2016	17.475613239987883
2017	17.548145810979918
2018	17.630339348279723
2019	17.72811223949128