Year	%
2000	25.601626260760995
2001	25.09081082846512
2002	24.735979640411138
2003	24.522733554736188
2004	23.9368488688253
2005	23.672702816685494
2006	23.333581343323377
2007	22.953904500173113
2008	22.33408452749049
2009	22.16763922493914
2010	21.49137744840825
2011	20.905830862874517
2012	20.609814105876175
2013	20.162334619989196
2014	19.826786583964466
2015	19.93229070344296
2016	19.43194554475858
2017	19.214096031811827
2018	18.83691404096721
2019	18.333253116452436