Year	% of population
2002	14
2004	14.6
2006	9
2007	6.6
2008	6.1
2009	6.9
2010	9.2
2012	24.5
2013	25
2014	26.7
2015	25.9
2016	25.7
2017	24.3
2018	23.2
2019	21.7
2020	21.2