Year	% of population
2001	25.7
2002	24.2
2003	20.8
2004	15.8
2005	12.3
2006	9.4
2007	7.1
2008	5.8
2009	3.9
2010	2.8
2011	2.5
2012	2.5
2013	2.5
2014	2.5
2015	2.5
2016	2.5
2017	2.5
2018	2.5
2019	2.5
2020	2.5
2021	2.5