Year	% of population
2008	16.2588914085251
2009	18.7120423882349
2010	18.3792890430729
2011	17.462461690869
2012	17.2491202625581
2013	17.1851470704261
2014	17.8827769650935
2015	18.0007447870272
2016	18.6968107467514
2017	19.4989423533713
2018	20.80287948758
2019	21.4098779927628