Year	% of population
1987	7
1992	7.2
1995	5
2000	5.5
2003	6.5
2004	6.5
2005	6.6
2006	6.2
2007	6.1
2008	6.4
2009	8
2010	8.2
2011	7.3
2012	7.1
2013	8
2014	7.6
2015	6.9
2016	7.4
2017	7.9
2018	7.7
2019	6.8
2020	7.5
2021	8