Year	% of population
2001	12.4
2002	11.3
2003	11
2004	10
2005	9.4
2006	9.3
2007	9.2
2008	9
2009	6.9
2010	5.6
2011	5
2012	5.8
2013	6
2014	6
2015	6.3
2016	6.3
2017	5.8
2018	4.5
2019	3.1
2020	2.7
2021	2.8