Year	% of population
2001	10.5
2002	9.8
2003	8.5
2004	8.7
2005	9.6
2006	10.7
2007	11.3
2008	11.6
2009	16.4
2010	19.7
2011	22
2012	18.5
2013	15.8
2014	14.4
2015	14.4
2016	14.5
2017	13.7
2018	12.9
2019	12.1
2020	11.9
2021	11.6