Year	% of population
2000	0.4
2001	0.4
2002	0.4
2003	0.5
2004	0.5
2005	0.55
2006	0.6
2007	0.7
2008	0.8
2009	0.9
2010	1.1
2011	1.2
2012	1.4
2013	1.6
2014	1.7
2015	2
2016	2.4
2017	2.7
2018	3
2019	3.3
2020	3.9
2021	4.2
2022	4.8