Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Position | Club | Played | Points | Wins | Draws | Losses | Goals for | Goals against | Goal Difference |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | UE Lleida | 38 | 57+19 | 23 | 11 | 4 | 56 | 20 | +36 |
| 2 | Real Valladolid | 38 | 52+14 | 20 | 12 | 6 | 50 | 30 | +20 |
| 3 | Racing de Santander | 38 | 52+14 | 23 | 6 | 9 | 56 | 38 | +18 |
| 4 | RCD Mallorca | 38 | 50+12 | 21 | 8 | 9 | 57 | 34 | +23 |
| 5 | Real Betis | 38 | 43+5 | 16 | 11 | 11 | 49 | 33 | +16 |
| 6 | Real Madrid B | 38 | 42+4 | 15 | 12 | 11 | 57 | 41 | +16 |
| 7 | Atlético Marbella | 38 | 42+4 | 17 | 8 | 13 | 45 | 41 | +4 |
| 8 | Barcelona B | 38 | 39+1 | 15 | 9 | 14 | 59 | 55 | +4 |
| 9 | CP Mérida | 38 | 39+1 | 13 | 13 | 12 | 43 | 42 | +1 |
| 10 | CD Castellón | 38 | 36-2 | 13 | 10 | 15 | 40 | 45 | -5 |
| 11 | CD Badajoz | 38 | 36-2 | 14 | 8 | 16 | 37 | 36 | +1 |
| 12 | SD Compostela | 38 | 35-3 | 10 | 15 | 13 | 35 | 39 | -4 |
| 13 | Villarreal CF | 38 | 34-4 | 13 | 8 | 17 | 38 | 51 | -14 |
| 14 | Palamós CF | 38 | 33-5 | 12 | 9 | 17 | 33 | 50 | -17 |
| 15 | Athletic de Bilbao B | 38 | 33-5 | 9 | 15 | 14 | 33 | 34 | -1 |
| 16 | SD Eibar | 38 | 32-6 | 10 | 12 | 16 | 33 | 44 | -11 |
| 17 | UE Figueres | 38 | 32-6 | 11 | 10 | 17 | 41 | 59 | -18 |
| 18 | CD Lugo | 38 | 25-13 | 7 | 11 | 20 | 23 | 41 | -18 |
| 19 | Sestao | 38 | 24-14 | 7 | 10 | 21 | 29 | 54 | -25 |
| 20 | CE Sabadell FC 1 | 38 | 24-14 | 8 | 8 | 22 | 30 | 57 | -27 |
Question:
how many clubs had a positive goal difference?
Answer:
10