Year	%
2000	20.257465241785848
2001	20.00387237441001
2002	20.03135523024722
2003	19.857924334702524
2004	19.44199354726343
2005	19.087726575029702
2006	18.685766132849576
2007	18.341041012517987
2008	18.0438904511933
2009	17.697326554743114
2010	17.555532370821723
2011	17.327004662579398
2012	17.082957061286024
2013	16.730744846610744
2014	16.56918831315163
2015	16.577640439062538
2016	16.47175627922397
2017	16.224359326054948
2018	16.094553724937846
2019	15.971018461589924