Year	% of population
2001	18.4
2002	16.9
2003	16
2004	15.9
2005	16.9
2006	18.5
2007	20.1
2008	20.7
2009	19.4
2010	18.4
2011	18
2012	19.3
2013	21.3
2014	24.7
2015	30.2
2016	34.2
2017	35.5
2018	34.1
2019	32.5
2020	31.5
2021	31.6