Year	% of population
2000	28.2
2001	28.1
2002	28.2
2003	28.3
2004	28.45
2005	28.8
2006	29.1
2007	29.7
2008	30.5
2009	31.1
2010	32.4
2011	33.4
2012	35
2013	36.6
2014	38.3
2015	40.2
2016	42.7
2017	44.9
2018	47.3
2019	49.3
2020	51.8
2021	54
2022	56.1