Year	% of population
2000	0.6
2001	0.8
2002	1.1
2003	1.5
2004	1.9
2005	2.3
2006	2.8
2007	3.3
2008	3.8
2009	4.2
2010	4.4
2011	4.8
2012	4.9
2013	5
2014	5.1
2015	5.3
2016	5.2
2017	5.2
2018	5.3
2019	5.4
2020	5.7
2021	5.8
2022	6