Year	% of population
2001	15.8
2002	16.1
2003	16.4
2004	16.5
2005	16.4
2006	16.3
2007	16.2
2008	16.1
2009	19.8
2010	23.8
2011	28.1
2012	30.4
2013	33
2014	34.8
2015	35.1
2016	34
2017	32.9
2018	33.1
2019	35.3
2020	36.8
2021	37.9