Year	% of population
2000	56
2001	58
2002	60
2003	62.3
2004	64.5
2005	66.7
2006	69
2007	71.2
2008	73.3
2009	75.3
2010	77.1
2011	78.7
2012	80
2013	81.4
2014	82.8
2015	83.8
2016	84.9
2017	85.8
2018	86.6
2019	87.4
2020	88.1
2021	88.7
2022	89.4