Year	%
2000	22.414072551258123
2001	22.105841583342947
2002	21.908316934981965
2003	21.73431165790241
2004	21.536087114351588
2005	20.865779942337344
2006	20.69301154144377
2007	20.415883011296103
2008	20.318496538613292
2009	20.224187891072532
2010	20.17740937813501
2011	19.87148251202527
2012	19.547508959373012
2013	19.284876259558175
2014	19.105398842736104
2015	19.03592687364859
2016	18.943633599214053
2017	18.853936139537165
2018	18.880890228331925
2019	18.86744129714912