Year	% of population
2000	3.8
2001	3.9
2002	4.1
2003	4.3
2004	4.5
2005	4.7
2006	5
2007	5.3
2008	5.7
2009	5.9
2010	6.4
2011	7
2012	7.4
2013	7.8
2014	8.3
2015	8.8
2016	9.05
2017	9.6
2018	9.8
2019	10.2
2020	10.1
2021	10.5
2022	10.3