Year	% of population
2008	29.7818888438232
2009	32.7311877329752
2010	32.7784119552432
2011	29.197299366285
2012	28.7000907483166
2013	30.8669857980849
2014	29.5599371522769
2015	30.2221334879207
2016	32.8872316117909
2017	30.8133259750535
2018	32.0191452189043
2019	31.8704538559767