Year	% of population
1996	38.6
1997	32.1
1998	33
1999	46.7
2000	41.9
2001	28.9
2002	30.5
2003	27.1
2004	17.8
2005	12.7
2006	11.1
2007	7.7
2008	6.1
2009	5.4
2010	5.2
2011	7.3
2012	6.3
2013	5.5
2014	4.8
2015	5.1
2016	5.7
2017	5.9
2018	5.6
2019	5
2020	4.8