Year	% of population
2004	9
2005	7.9
2006	8.4
2007	8.3
2008	9.1
2009	9.1
2010	8.7
2011	8.7
2012	10.1
2013	10.1
2014	11.7
2015	11.7
2016	10.2
2017	11
2018	9.1
2019	9.3
2020	9.1
2021	9.7