Year	% of population
2000	14.8
2001	15
2002	15.2
2003	15.1
2004	14.9
2005	14.7
2006	14.4
2007	13.9
2008	13.4
2009	12.9
2010	12.2
2011	11.6
2012	10.8
2013	10.3
2014	9.7
2015	9.1
2016	8.7
2017	8
2018	7.6
2019	7.25
2020	7.1
2021	6.6
2022	6.4