Year	% of population
2000	64.4
2001	54.9
2003	49.9
2004	44.6
2005	42.2
2006	37.6
2007	36.7
2008	35.1
2009	36
2010	32.8
2011	28.6
2012	27.3
2013	25.6
2014	22.5
2015	23.3
2016	22.9
2017	21.5
2018	23.2
2019	25
2020	33
2021	27.7
2022	25.2