Year	% of population
2001	5.2
2002	5.4
2003	6
2004	6.3
2005	6.4
2006	6
2007	5.6
2008	5.5
2009	5.2
2010	5.1
2011	4.9
2012	5.1
2013	5.3
2014	5.5
2015	5.8
2016	6
2017	6.4
2018	6.3
2019	6.3
2020	6.4
2021	7.2