Year	% of population
2000	38.5
2001	39.1
2002	39.9
2003	40
2004	40.2
2005	40.4
2006	40.4
2007	40.3
2008	40.3
2009	40.2
2010	40.1
2011	40.5
2012	40.9
2013	42
2014	42.9
2015	44.2
2016	45.7
2017	47.8
2018	49.9
2019	52.3
2020	54.6
2021	56.9
2022	59.1