Year	% of population
2000	51.9
2001	54.2
2002	56.1
2003	57.9
2004	60.4
2005	62.1
2006	64.3
2007	66.1
2008	68.2
2009	70.1
2010	71.5
2011	72.8
2012	74.2
2013	75.1
2014	76
2015	76.6
2016	76.9
2017	77.2
2018	77.3
2019	77.3
2020	77.1
2021	77.3
2022	77