Year	% of population
2001	22.9
2002	20.9
2003	18.9
2004	18.5
2005	17.8
2006	17.4
2007	16.1
2008	15.4
2009	14.6
2010	14.5
2011	14.2
2012	13.7
2013	13.2
2014	13.1
2015	13.3
2016	13.6
2017	13.7
2018	14
2019	14.6
2020	15.5
2021	16.2