Year	% of population
2001	5.8
2002	5.6
2003	5.4
2004	5.3
2005	5.1
2006	5
2007	5.3
2008	5
2009	5
2010	4.7
2011	5.1
2012	5.4
2013	5.6
2014	5.7
2015	5.9
2016	6.1
2017	6.2
2018	5.9
2019	6.6
2020	6.9
2021	6.8