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 | Team | Played | Drawn | Lost | Goals For | Goals Against | Goal Difference | Points 1 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1.0 | Kirkby Town | 34.0 | 5.0 | 3.0 | 83.0 | 30.0 | +53 | 57 |
| 2.0 | Colwyn Bay | 34.0 | 10.0 | 2.0 | 75.0 | 32.0 | +43 | 54 |
| 3.0 | Newton | 34.0 | 10.0 | 8.0 | 56.0 | 33.0 | +23 | 42 |
| 4.0 | Urmston Town | 34.0 | 10.0 | 10.0 | 42.0 | 39.0 | +3 | 38 |
| 5.0 | Blackpool Mechanics | 34.0 | 7.0 | 12.0 | 61.0 | 48.0 | +13 | 37 |
| 6.0 | Lytham | 34.0 | 7.0 | 13.0 | 54.0 | 45.0 | +9 | 35 |
| 7.0 | Atherton Collieries | 34.0 | 8.0 | 13.0 | 44.0 | 44.0 | 0 | 34 |
| 8.0 | Ashton Town | 34.0 | 7.0 | 14.0 | 62.0 | 56.0 | +6 | 33 |
| 9.0 | Oldham Dew | 34.0 | 10.0 | 13.0 | 51.0 | 44.0 | +7 | 32 |
| 10.0 | Bolton ST | 34.0 | 8.0 | 14.0 | 55.0 | 73.0 | −18 | 32 |
| 11.0 | Maghull | 34.0 | 7.0 | 15.0 | 56.0 | 51.0 | +5 | 31 |
| 12.0 | Cheadle Town | 34.0 | 7.0 | 15.0 | 46.0 | 62.0 | −16 | 31 |
| 13.0 | Bacup Borough | 34.0 | 8.0 | 15.0 | 54.0 | 59.0 | −5 | 30 |
| 14.0 | Ashton Athletic | 34.0 | 6.0 | 16.0 | 45.0 | 61.0 | −16 | 30 |
| 15.0 | Daisy Hill | 34.0 | 9.0 | 15.0 | 51.0 | 61.0 | −10 | 27 2 |
| 16.0 | Whitworth Valley | 34.0 | 7.0 | 17.0 | 51.0 | 71.0 | −20 | 27 |
| 17.0 | Nelson | 34.0 | 4.0 | 21.0 | 43.0 | 80.0 | −37 | 22 |
| 18.0 | Prestwich Heys | 34.0 | 4.0 | 23.0 | 35.0 | 75.0 | −40 | 16 2 |
Question:
What is the goal difference number with a position of 15?
Answer:
−10