Year	% of population
2000	8.3
2001	8.4
2002	8.5
2003	8.6
2004	9
2005	9.3
2006	9.6
2007	10.2
2008	10.8
2009	11.6
2010	12.6
2011	13.6
2012	14.6
2013	15.7
2014	16.8
2015	18.2
2016	19.4
2017	20.7
2018	21.9
2019	23.5
2020	24.9
2021	26.4
2022	28