Table:
text: 1963–64 Segunda División
Group II
Group II
Position_ Club Played Points Wins Draws Losses Goals_for Goals_against Goal_Difference
10 Onteniente CF 30 29 10 9 11 33 29 +4
11 Recreativo de Huelva 30 29 10 9 11 41 34 +7
12 Melilla CF 30 28 10 8 12 34 38 -4
13 CD Abarán 30 26 10 6 14 38 49 -11
14 Atlético Ceuta 30 26 10 6 14 29 49 -20
15 CD San Fernando 30 21 9 3 18 24 45 -21
16 CD Eldense 30 19 7 5 18 33 55 -22

Question: What is the lowest goal difference if the position in Group II of the 1963–64 Segunda División is higher than 16?