Year	% of population
2001	22.7
2002	20.6
2003	19.2
2004	17.5
2005	15.8
2006	14
2007	12.5
2008	11.1
2009	8.2
2010	5.9
2011	4
2012	3.7
2013	3.8
2014	4.1
2015	4.4
2016	5
2017	5.6
2018	5.9
2019	5.8
2020	5.6
2021	6.4