Year	%
2000	18.53751278315534
2001	18.22272324361079
2002	17.978664367923123
2003	17.871618458131866
2004	17.60834676140026
2005	17.169328240133353
2006	16.898734803118014
2007	16.699622968859128
2008	16.64468774966557
2009	16.429036326649452
2010	16.253120174906496
2011	16.03845149442447
2012	15.852806297813132
2013	15.621598364477835
2014	15.475832868079335
2015	15.432629732646488
2016	15.505654448216758
2017	15.14111011713169
2018	14.967755596627569
2019	14.782141246749243