Year	% of population
2004	29.4103890069505
2005	31.0197357780177
2006	30.7501041037207
2007	32.3792771655451
2008	34.6211254576984
2009	33.1210817543388
2010	33.4871904449015
2011	34.1954473522408
2012	35.4201415930258
2013	36.5297373925331
2014	37.1057306544455
2015	36.5347534385449
2016	36.0602768561565
2017	36.4241126564064
2018	37.9296760938457
2019	37.3016718213635