Year	%
2000	19.11340097887582
2001	18.765412018755313
2002	18.592564052991094
2003	18.31715673649158
2004	17.747440183496234
2005	17.47877036827015
2006	16.81608818693505
2007	16.403571307858982
2008	16.137436337117702
2009	15.785327866822852
2010	15.430467488478065
2011	15.020609086059938
2012	14.715828687835424
2013	14.418361032069837
2014	14.420249951716984
2015	14.188670525329872
2016	14.16452502599675
2017	13.800304536776693
2018	13.620535699986476
2019	13.37397709369061