Year	% of population
2000	29.6
2001	31.2
2002	33
2003	34.5
2004	36
2005	37.1
2006	38.4
2007	39.2
2008	40.1
2009	40.9
2010	41.5
2011	41.8
2012	42.6
2013	42.9
2014	43.5
2015	44.2
2016	44.6
2017	45.2
2018	46
2019	46.5
2020	47.3
2021	48.2
2022	48.9