Year	% of population
2001	30.81380318707675
2002	29.809581363385256
2003	28.785417846016284
2004	27.662506924255116
2005	26.70294936776115
2006	25.661516453252524
2007	24.84242538733047
2008	23.934294864125306
2009	22.180518922711343
2010	20.676281639256253
2011	19.380175848608292
2012	19.29625805412537
2013	18.901167700436865
2014	19.08553810330654
2015	19.72111410825141
2016	20.010401288602893
2017	20.097768589447487
2018	20.096822078986477
2019	20.592168088742785
2020	21.2821403569964
2021	21.751678078917756