Year	% of population
2007	14.772045304569
2008	16.7600039903227
2009	18.3726753729648
2010	14.1316456172181
2011	16.6659483886459
2012	13.317787288382
2013	12.0312076322031
2014	13.7242883171691
2015	15.3567937218212
2016	15.4620933512479
2017	15.332242134806
2018	15.9097709714604
2019	15.4620848005072
2020	17.516253452806