Year	% of population
1992	58.1
1997	37.4
2002	28.9
2004	19.5
2006	16
2008	14.5
2010	20.7
2012	17.2
2014	13.5
2016	9.8
2017	7.9
2018	6.7
2019	5.7
2020	4.8