Year	% of population
2000	33.1
2001	35.9
2002	38.8
2003	41.6
2004	44.6
2005	47.2
2006	49.6
2007	52.4
2008	54.9
2009	57.1
2010	59.6
2011	62.3
2012	64.7
2013	66.8
2014	69.7
2015	72.5
2016	75.5
2017	78
2018	80.8
2019	83.6
2020	85.5
2021	87.6
2022	89.5