Year	% of population
2000	29.4
2001	30.3
2002	31.2
2003	32.1
2004	33
2005	33.8
2006	34.9
2007	35.8
2008	36.8
2009	37.1
2010	40
2011	40.8
2012	41.6
2013	42.5
2014	43.4
2015	44.3
2016	45.3
2017	46.2
2018	47
2019	47.7
2020	48.7
2021	49.7
2022	50.6