Year	% of population
2004	8
2005	7.8
2006	7.8
2007	7.4
2008	6.9
2009	7.9
2010	9.1
2011	8.8
2012	9.6
2013	10.1
2014	9.4
2015	9.5
2016	8.8
2017	7.8
2018	6.8
2019	6.9
2020	7
2021	6.7