Year	% of population
2001	28.073489666818187
2002	27.181708404634197
2003	26.311450802682934
2004	25.302991822448845
2005	24.416118631781696
2006	23.475983842368592
2007	22.73436920764825
2008	21.933410229063075
2009	20.56039265324315
2010	19.410660593666375
2011	18.435110874892665
2012	18.377306646872807
2013	18.097471738670905
2014	18.2706862505012
2015	18.825405843244216
2016	19.03932904407893
2017	19.10506025615281
2018	19.07573311403316
2019	19.480419479053392
2020	20.062528645762466
2021	20.496384411091665