Year	% of population
1989	35.8
1991	37.4
1995	33.8
1996	34.4
1998	36.9
1999	34.7
2000	33.2
2001	33.9
2002	34.1
2003	33.9
2004	31.2
2005	31.5
2006	29.4
2007	27.8
2008	29.9
2009	30
2010	29.5
2011	27.7
2012	27.5
2013	27.3
2014	26.4
2015	25
2016	26.2
2017	24.8
2018	24.5
2019	23
2021	24.7
2022	23.9