Year	% of population
2000	5.3
2001	6.7
2002	8.1
2003	9.8
2004	11.4
2005	13
2006	14.9
2007	16.5
2008	18.1
2009	19.7
2010	21.4
2011	23
2012	24.7
2013	26.4
2014	28.1
2015	29.7
2016	31.3
2017	32.8
2018	34.3
2019	35.5
2020	36.9
2021	38.4
2022	39.6