Year	% of population
2000	3.6
2001	3.9
2002	4.3
2003	4.8
2004	5.4
2005	5.8
2006	6.3
2007	6.9
2008	7.4
2009	7.6
2010	8.2
2011	8.4
2012	8.9
2013	9
2014	9.5
2015	9.6
2016	9.8
2017	9.8
2018	10.1
2019	10.2
2020	10.4
2021	10.4
2022	10.5