Year	% of population
2001	6.3
2002	5.7
2003	5.6
2004	5.4
2005	5.5
2006	5.6
2007	6.3
2008	6.7
2009	6.4
2010	5.8
2011	5.4
2012	5.8
2013	6.3
2014	6.6
2015	6.8
2016	6.4
2017	6
2018	5.3
2019	4.8
2020	4.7
2021	4.9