Year	% of population
1979	7.7
1986	5.7
1991	6
1995	7
2000	5.7
2003	7.4
2004	7.1
2005	7.3
2006	9
2007	7.6
2008	8.3
2009	7.9
2010	7.7
2011	8
2012	8
2013	8.2
2014	8.5
2015	9.1
2016	9.7
2017	9.1
2018	9
2019	9.4