Year	% of population
2000	22.6
2001	23
2002	23.6
2003	24.4
2004	25
2005	26.1
2006	27.3
2007	28.8
2008	30.7
2009	32.7
2010	34.9
2011	36.8
2012	38.6
2013	40.7
2014	42.7
2015	44.3
2016	45.9
2017	47.6
2018	48.9
2019	50.4
2020	51.7
2021	52.9
2022	54.2