Year	% of population
2000	19.1
2001	22.2
2002	21.7
2003	23
2004	24.3
2005	18.2
2006	27
2007	33
2008	30
2009	31.1
2010	34.2
2011	35.3
2012	36.4
2013	37.6
2014	38.8
2015	39.5
2016	41.2
2017	42.9
2018	43.6
2019	44.9
2020	45.4
2021	47.7
2022	49