Year	% of population
2001	2.635833869375586
2002	2.61053807748964
2003	2.6007530619470716
2004	2.5981948407155757
2005	2.5898226439387075
2006	2.5941553795218772
2007	2.5829481199490414
2008	2.5721405429834237
2009	2.5652522493532093
2010	2.568966240199802
2011	2.5819289208734646
2012	2.568992931815736
2013	2.5568219356924384
2014	2.559037083503346
2015	2.5559754125949294
2016	2.553711548508415
2017	2.527799180082582
2018	2.514462890359778
2019	2.5058949343024124
2020	2.5013813022454943
2021	2.506089519461321