Year	% of population
1992	23.9
1993	22.2
1995	29.8
1996	28.6
2002	23.4
2003	19.6
2004	19.2
2005	17.5
2006	16.6
2007	15
2008	12.9
2009	12.8
2010	11.8
2011	10.9
2012	11
2013	10.1
2014	9.5
2015	11.3
2016	12.1
2017	11.1
2018	11.4
2019	11.2
2020	10.1