Year	% of population
2001	19
2002	19
2003	18.9
2004	19.1
2005	19.3
2006	19.1
2007	18.5
2008	17.4
2009	15.6
2010	13.2
2011	11
2012	9.6
2013	8.4
2014	7.9
2015	7.3
2016	6.7
2017	6
2018	5.9
2019	6
2020	6.1
2021	5.9