Year	% of population
2008	27.5816975043982
2009	19.3460987397823
2010	24.2561669366943
2011	21.3405034194073
2012	28.9501856603603
2013	25.4409417358528
2014	31.9337500108335
2015	35.6806313101469
2016	35.4758495757761
2017	36.6209107789609
2018	33.0757053527813
2019	36.6024005646409