Anno	6-10 anni	11-14 anni	15-17 anni
2010	21,60	16,90	20,80
2011	23,30	17,00	20,30
2012	17,60	19,00	20,30
2013	24,80	19,10	22,50
2014	22,30	19,20	19,80
2015	21,20	20,70	21,00
2016	23,20	18,40	19,70
2017	18,80	15,50	16,60
2018	19,90	14,70	17,30