Year	% of population
2001	4
2002	3.8
2003	3.7
2004	3.6
2005	3.5
2006	3.5
2007	3.5
2008	3.7
2009	5.4
2010	6.9
2011	8.8
2012	8.8
2013	9.2
2014	8.9
2015	9.2
2016	8.9
2017	8.4
2018	6.9
2019	5.7
2020	5.9
2021	6.6