group,value A,18.2 A,20.1 A,17.6 A,16.8 A,18.8 A,19.7 A,19.1 B,17.4 B,18.7 B,19.1 B,16.4 B,15.9 B,18.4 B,17.7 C,15.2 C,18.8 C,17.7 C,16.5 C,15.9 C,17.1 C,16.7