Year	ages 15+
2000	26.8027149535121
2005	24.2970375025595
2010	22.2713920656645
2011	21.84145312584
2012	21.5836573651583
2013	21.2239838060683
2014	20.8713436096617
2015	20.5467819112028
2016	20.2572952996569