Year	% of population
2000	2.05
2001	2.1
2002	2.1
2003	2.1
2004	2.1
2005	2.1
2006	2.1
2007	2.2
2008	2.2
2009	2.3
2010	2.3
2011	2.4
2012	2.4
2013	2.4
2014	2.3
2015	2.3
2016	2.2
2017	2
2018	1.9
2019	1.8
2020	1.7
2021	1.5
2022	1.4