Year	% of population
2000	17.6
2001	18.7
2002	19.4
2003	20.2
2004	21.1
2005	21.9
2006	22.9
2007	23.7
2008	24.8
2009	25.9
2010	26.7
2011	27.8
2012	28.8
2013	29.4
2014	30.7
2015	31.6
2016	32.65
2017	33.9
2018	34.8
2019	36.3
2020	37.25
2021	38.4
2022	39.6