Year	% of population
2006	24.6
2007	23.6
2008	22.1
2009	21.6
2010	22.3
2011	22.9
2012	23
2013	25.1
2014	25.4
2015	25.3
2016	23.6
2017	23.5
2018	23.8
2019	23.4
2020	22.5
2021	21.2