Year	%
2000	18.75784701917297
2001	18.469935761374487
2002	18.679961494276984
2003	18.762471563883814
2004	18.585782622768996
2005	17.890445163238045
2006	17.202754756005643
2007	16.660795053994036
2008	16.193906840220173
2009	15.789939211041784
2010	15.438250651352602
2011	15.080680347738392
2012	14.628548623801787
2013	14.205635319851176
2014	13.938006020956076
2015	13.722120247107979
2016	13.556222041584077
2017	13.421557900771223
2018	13.30583456809531
2019	13.205528524367129