Year	% of population
2003	19.1
2004	16
2005	14.3
2006	13.3
2007	12.4
2008	12.6
2009	13.7
2010	15.4
2011	14.2
2012	13.3
2013	13.9
2014	13.4
2015	12.4
2016	11.5
2017	11.8
2018	11.6
2019	10.7
2020	10.6
2021	10