Year	% of population
2008	22.776526445289
2009	21.0933840482918
2010	20.7780018593157
2011	21.9202126474759
2012	25.2648338266101
2015	22.3686184669894
2016	24.2022786902922
2017	21.7498206417374
2018	22.2905857564505
2019	21.3897378065169
2020	21.6345402855447