Year	% of population
2000	30.1
2001	32.1
2002	33.4
2003	34.8
2004	36.2
2005	37.5
2006	38.9
2007	39.8
2008	40.75
2009	42.1
2010	42.4
2011	43.4
2012	44.1
2013	44.5
2014	45
2015	45.9
2016	46.5
2017	46.9
2018	47.6
2019	48.1
2020	48.9
2021	49.4
2022	50.1