Year	% of population
1999	16.4
2000	15.2
2001	16.4
2002	17.7
2003	18.9
2004	20.2
2005	20.2
2006	22.8
2007	24.1
2008	25.4
2009	26.7
2010	28.1
2011	29.5
2012	26.2
2013	32.2
2014	33.5
2015	34.9
2016	33.5
2017	35.4
2018	45
2019	42.2
2020	44.7
2021	46.8
2022	47.7