Year	ages 15+
2000	23.5111097262241
2005	20.9363541606176
2010	19.0704026599124
2011	18.6805796534615
2012	18.4233751977513
2013	18.121027186162
2014	17.826837772282
2015	17.5985604916349
2016	17.3642495459391