Year	% of population
2004	30.2529287331986
2005	30.4932431376121
2006	31.8521042110768
2007	33.6281033350421
2008	36.1973171772041
2009	34.7182113466129
2010	33.8324363762777
2011	35.825165615861
2012	36.617280236347
2013	36.6415922205718
2014	37.3983374893538
2015	37.5289148067638
2016	38.1140230980395
2017	35.9350140616609
2018	37.2448878896849
2019	41.6782282332244