Year	% of population
1987	5.5
1991	5.2
1995	4.2
2000	7.5
2003	7.9
2004	7.3
2005	7.3
2006	7.9
2007	7.9
2008	8.2
2009	8.2
2010	8.4
2011	7.9
2012	7.6
2013	7.8
2014	8
2015	7.7
2016	7.6
2017	8.1
2018	7.7
2019	8
2020	7.6
2021	7.8