Year	% of population
2001	32.3
2002	33.7
2003	35
2004	32.1
2005	28.4
2006	26.1
2007	27.1
2008	27
2009	24.3
2010	21.3
2011	19.2
2012	18.3
2013	18.1
2014	18.3
2015	20
2016	21.5
2017	22.8
2018	22.2
2019	23
2020	24.7
2021	27.8