Year	% of population
2000	33.8
2001	34.4
2002	35.1
2003	35.8
2004	36.5
2005	37.2
2006	37.9
2007	38.6
2008	39.45
2009	39.9
2010	40.7
2011	41.3
2012	42.3
2013	42.8
2014	43.5
2015	44.2
2016	44.8
2017	45.5
2018	46
2019	46.5
2020	46.9
2021	47.2
2022	47.4