Year	% of population
2001	2.566031277283791
2002	2.5346114623062412
2003	2.5347467443638196
2004	2.5343188050552294
2005	2.5240656595633526
2006	2.524845878858053
2007	2.521774340876034
2008	2.519990496338864
2009	2.5310685652418012
2010	2.554930782267159
2011	2.5335152554240454
2012	2.516100420836544
2013	2.511254238288469
2014	2.510755354343059
2015	2.5097520403877343
2016	2.5103063455798584
2017	2.5056818169159327
2018	2.5157564998385973
2019	2.5479016349933103
2020	2.5896907662424153
2021	2.674326575620777