Year	% of population
2001	4.1
2002	4
2003	3.9
2004	3.9
2005	3.9
2006	4
2007	4
2008	3.9
2009	4.1
2010	4.5
2011	4.8
2012	4.9
2013	5
2014	5.3
2015	5.7
2016	6.1
2017	6.5
2018	6.3
2019	5.9
2020	5.4
2021	5.1