17.3 17.8 18,0 20.5 20.4 15 , r 15.6 17.6 17.1 10,0 12.1 12.6 16,0 14.4 13.4 17.2 12.8 17.3 17.3 16,8 16.4 17.9 6,1 16.9 17.1 16,3 11.1 11,7 17,2 20,0S.