Year	% of population
1992	4.2
1993	5.2
1996	8.5
2002	9.5
2004	10.5
2005	10.3
2006	9.2
2007	7.8
2008	7.5
2009	7.6
2010	9.1
2011	9.4
2012	8.3
2013	9.1
2014	7.6
2015	7.9
2016	7
2017	6
2018	6.2
2019	5.9
2020	6.9
2021	6.9