I 19.7 17.2 9.2 5.9 29.8 10.0 21.4  
II 19.9 21.1 20.3 15.3 27.9 15.1 23.0
III 20.3 21.2 24.7 21.1 20.7 19.0 21.9
IV 20.2 20.3 24.6 26.4 14.3 23.8 17.7
V 19.9 20.1 21.2 31.3 7.4 32.1 16.0
muestra 187369 20193 2211 3668 4900 3609 5805