Year	% of population
2000	0.9
2001	0.9
2002	0.9
2003	0.8
2004	0.8
2005	0.8
2006	0.8
2007	0.8
2008	0.8
2009	0.8
2010	0.9
2011	0.9
2012	0.9
2013	0.9
2014	0.9
2015	0.9
2016	0.8
2017	0.8
2018	0.8
2019	0.8
2020	0.7
2021	0.7
2022	0.6