Year	% of population
2000	34.9
2001	36
2002	37
2003	38
2004	38.4
2005	38.5
2006	38.2
2007	37.7
2008	36.5
2009	35.2
2010	33.6
2011	31.9
2012	30.7
2013	29
2014	28.2
2015	27.5
2016	27.3
2017	27.7
2018	28.2
2019	28.85
2020	30
2021	31.3
2022	32.3