Year	%
2000	21.706590210713806
2001	21.595471985075346
2002	21.512850816788262
2003	21.04749306579956
2004	20.365041466112697
2005	20.385012833356406
2006	20.437590090074718
2007	20.430719829111638
2008	20.240789119841406
2009	19.966567581097934
2010	20.104649336910775
2011	20.145858718061138
2012	20.226756421740586
2013	19.930445168479068
2014	19.680030810795014
2015	20.079017156211954
2016	19.93984240190311
2017	19.606169928588834
2018	19.451885813996796
2019	19.328419088741185