Year	% of population
2008	27.4076355192303
2009	26.511798799763
2010	29.2604234254432
2011	29.55060734155
2012	29.9913535247372
2015	27.3314244087503
2016	28.4562685610297
2017	29.1161860959289
2018	29.8095602141734
2019	31.8791187698607
2020	22.0819123768327