Year	% of population
2004	14.7
2005	17.2
2006	13.1
2007	13.6
2008	14
2009	14.1
2010	15.1
2011	15.1
2012	17
2013	16.8
2014	16.6
2015	15.8
2016	16
2017	15
2018	13.4
2019	12.2
2020	13.6
2021	9.7