Year	% of population
2001	8.2
2002	7.7
2003	8.1
2004	8.3
2005	9.1
2006	8.4
2007	7.7
2008	6.9
2009	7
2010	7
2011	6.7
2012	6.3
2013	6.2
2014	6.5
2015	6.8
2016	7
2017	7
2018	6.9
2019	7
2020	7.5
2021	8.7