Year	% of population
2008	19.7382071496788
2009	22.5508213047078
2010	17.7856175414467
2011	19.9418859038946
2012	21.5736466277772
2014	23.1409648163268
2015	25.1462947828191
2016	25.4189683094722
2017	27.0203080167493
2018	22.6582875729071
2019	20.9512186907519
2020	23.3158180900991