Year	% of population
2001	3.018217495384383
2002	2.915010426679097
2003	2.873909942949426
2004	2.8577330304723003
2005	2.8181200365202774
2006	2.8371294883401665
2007	2.7982727940552112
2008	2.7585289360953653
2009	2.748038330933137
2010	2.7829731970674567
2011	2.846648599721171
2012	2.793017347577654
2013	2.7424316449685744
2014	2.753042494448032
2015	2.7409984666933815
2016	2.7323364332919544
2017	2.6207359040548908
2018	2.5630488157071927
2019	2.5242775109179543
2020	2.5
2021	2.5161140245343114