Year	% of population
2000	19.6758592434111
2001	19.6307930338056
2002	19.5857161369543
2003	19.5402568756526
2004	19.494323788752
2005	19.0900060179821
2006	18.6919049674513
2007	18.299932959832
2008	17.9134931734612
2009	17.5322561326176
2010	17.1561360260702
2011	16.7845740435899
2012	16.4174831607174
2013	16.0545442265229
2014	15.6952337786673
2015	15.339470930665
2016	14.9871578842415
2017	14.6375922800038
2018	14.2906969434053
2019	13.9461923530837
2020	13.6038064731592
2021	13.263273625482
2022	13.3469110130017