Year	% of population
2006	29
2007	26.3
2008	23.7
2009	23.9
2010	24.8
2011	26.4
2012	26.8
2013	27.5
2014	27.2
2015	25.8
2016	24.5
2017	24.1
2018	21.3
2019	22.2
2020	21.5
2021	20.1