Year	ages 15+
2000	26.3513298305175
2005	23.842046859452
2010	21.8004542830762
2011	21.3672506939497
2012	21.1006607009274
2013	20.7356408120273
2014	20.3803266598121
2015	20.0511403935906
2016	19.7557744090286