Year	ages 15+
2000	27.7164736312154
2005	24.9727533095707
2010	22.7283075402729
2011	22.27035756418
2012	21.9582764663762
2013	21.5578784916937
2014	21.1728721843261
2015	20.813671891782
2016	20.4857840022143