Year	% of population
2000	20.8890375660829
2001	20.7093329476087
2002	20.5302991432397
2003	20.3519380019401
2004	20.1740297382707
2005	19.997486703976
2006	19.8216306167035
2007	19.6466904958121
2008	19.4726681698671
2009	19.300236305739
2010	19.1284989373377
2011	18.9581294726295
2012	18.7893419757125
2013	18.6225717912501
2014	18.457810446265
2015	18.2950455952432
2016	18.134268525722
2017	17.9756859337382
2018	17.8192842351728
2019	17.6652644849558
2020	17.5133995904962
2021	17.3638910070716
2022	17.2167210100441