Year	% of population
1989	31.2
1992	30.6
1994	31.9
1996	34.6
1998	34.6
2000	32.5
2002	30.5
2004	29.1
2005	29.8
2006	28.4
2008	30.1
2010	27.6
2012	27.5
2014	27
2016	25.2
2018	23.9
2020	24.7
2022	22.5