Year	% of population
2001	25.816613844140683
2002	25.506481207034405
2003	24.812169643942575
2004	23.916945272186368
2005	22.868741113501144
2006	22.093564728392987
2007	21.620259786412138
2008	21.22747563822182
2009	19.953440328922554
2010	18.682985634345968
2011	17.68313771687032
2012	17.8093130201255
2013	17.690629300108963
2014	18.17444334591998
2015	18.950530913558556
2016	19.503284310476737
2017	19.712802913861125
2018	19.64799307114978
2019	20.42577274620798
2020	21.460608007812297
2021	22.625793578418474