Year	% of population
2001	6.1
2002	5.9
2003	6.3
2004	5.9
2005	5.9
2006	5.1
2007	5.1
2008	4.7
2009	3.9
2010	3.2
2011	2.5
2012	2.5
2013	2.5
2014	2.5
2015	2.5
2016	2.6
2017	2.6
2018	2.5
2019	2.5
2020	2.5
2021	2.5