Year	% of population
2006	23.4002163434437
2009	21.544283877105
2011	23.4459674677783
2012	22.8891495624849
2015	26.3346502196779
2016	24.4752930875623
2017	24.8989714252058
2018	26.2155258685942
2019	25.4290305033218
2020	21.0126520741852