Year	% of population
1983	7.2
1987	6.7
1990	8.2
1993	10
1999	7.5
2004	10.1
2005	9.1
2006	9.1
2007	8.8
2008	9.8
2009	9.3
2010	9.6
2011	9.2
2012	8.8
2013	9.6
2014	9.3
2015	9.3
2016	9.5
2017	9
2018	9.2
2019	9.9
2020	9
2021	8.8