Year	% of population
2000	1.48527554119792
2001	1.57269961012382
2002	1.65877687120074
2003	1.74349423321782
2004	1.82682458497727
2005	1.90875865358061
2006	1.98926562310652
2007	2.06835562111719
2008	2.14598234098765
2009	2.22214325776217
2010	2.2968221506588
2011	2.37000255109368
2012	2.44166806812635
2013	2.51182909499601
2014	2.58041746739649
2015	2.56875452586908
2016	2.55700531526149
2017	2.54519843902031
2018	2.53330563520672