Year	% of population
2001	24.5
2002	20.6
2003	21
2004	21.3
2005	21.6
2006	18.5
2007	16.1
2008	14.1
2009	12.1
2010	10.4
2011	8.4
2012	7.7
2013	7.5
2014	7.5
2015	7.3
2016	7
2017	6.1
2018	5.2
2019	4.7
2020	4.9
2021	5.3