Year	% of population
2008	34.7938127168246
2009	33.6128528202446
2010	34.2851500555321
2011	36.7305125536524
2012	34.6394946020419
2015	33.7295502313109
2016	33.5172370172528
2017	34.4122111171569
2018	32.8492335601942
2019	33.3039021234547
2020	32.7823327912725