Year	%
2000	28.329492698258697
2001	28.034351235857397
2002	27.659598232309197
2003	27.511242563728274
2004	27.23146575309549
2005	26.931158604960483
2006	26.757321316514297
2007	26.41524085622672
2008	26.196247721105863
2009	25.929588413302135
2010	25.656329217495074
2011	25.444324540850694
2012	25.139742483170778
2013	24.85699943648184
2014	24.385664898033827
2015	24.043741117976573
2016	23.78471294157965
2017	23.49378527027054
2018	23.355826903622326
2019	23.194347341595023