Year	% of population
2001	10
2002	10.5
2003	11.1
2004	11.5
2005	11.2
2006	10.7
2007	10
2008	9.7
2009	10.6
2010	11
2011	11.3
2012	10.7
2013	10.8
2014	11
2015	11.3
2016	11.5
2017	12
2018	12.7
2019	13.2
2020	13.4
2021	12.2