Year	% of population
2001	2.5
2002	2.5
2003	2.5
2004	2.5
2005	2.5
2006	2.5
2007	2.5
2008	2.5
2009	2.6
2010	2.8
2011	2.6
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	2.7
2021	3.2