Year	% of population
2004	27.2196844619737
2005	27.6037286042508
2006	30.5047557594025
2007	33.1635525705489
2008	37.0521849845735
2009	17.9661078849414
2010	18.4449513769333
2011	18.3921538609493
2012	15.8607450082164
2013	16.6905692574899
2014	17.6757640256123
2015	17.1004145992724
2016	17.960378362579
2017	16.5630940122622
2018	15.5255708265927
2019	14.4578637026272