Year	% of population
2006	30.1009390021581
2009	27.9467696414169
2011	28.3104496205996
2012	28.3446475182455
2015	30.5353119182891
2016	29.6319126382376
2017	30.2720284520893
2018	30.8578785524622
2019	30.5058151278559
2020	26.0327016302211