Year	% of population
2001	24.1
2002	22.3
2003	20.3
2004	18
2005	17
2006	16.1
2007	14.9
2008	13.1
2009	11.3
2010	10.1
2011	9.1
2012	8.4
2013	7.7
2014	7.2
2015	6.3
2016	5.4
2017	4.8
2018	4.7
2019	4.9
2020	5.2
2021	5.4