Year	%
2000	23.30476114607905
2001	22.651863138513207
2002	22.220694406524533
2003	21.884818658249344
2004	21.05876972445142
2005	20.733508853619313
2006	20.220874363482547
2007	19.87381935292077
2008	19.38627128603301
2009	19.215990069876653
2010	18.772069919002305
2011	18.35726296175664
2012	18.10851524570698
2013	17.74111740097064
2014	17.246063388038607
2015	17.346464653520176
2016	16.958545013403274
2017	16.669654943913187
2018	16.414055282992887
2019	16.066716379524177