Year	% of population
2000	16
2001	17.7
2002	19.2
2003	20.85
2004	22.4
2005	23.9
2006	25.4
2007	26.9
2008	28.5
2009	29.8
2010	31.1
2011	32.4
2012	33.6
2013	34.9
2014	35.9
2015	36.8
2016	37.8
2017	38.7
2018	39.2
2019	39.8
2020	40.2
2021	41.1
2022	41.5