Year	%
2000	20.641502182595374
2001	20.056943188731843
2002	19.667431976937078
2003	19.312449235689545
2004	18.694110783701195
2005	18.339837061251853
2006	17.850090909484873
2007	17.56030649499283
2008	17.249354762672947
2009	17.009199477771507
2010	16.671816447277248
2011	16.30536357615976
2012	16.035585085994136
2013	15.769803883895888
2014	15.501628509281582
2015	15.5023336565932
2016	15.408809567144093
2017	15.110235271609598
2018	14.870055011141648
2019	14.653065282725892