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:
| Outcome | Year | Championship | Opponent in the final | Score (l) = score in legs, (s) = score in sets. |
| --- | --- | --- | --- | --- |
| Runner-up | 2010.0 | World Darts Championship | Phil Taylor Category:Articles with hCards | 3–7 (s) |
| Runner-up | 2012.0 | Premier League Darts | Phil Taylor Category:Articles with hCards | 7–10 (l) |
| Winner | 2012.0 | European Championship | Wes Newton Category:Articles with hCards | 11–5 (l) |
| Runner-up | 2012.0 | Championship League Darts | Phil Taylor Category:Articles with hCards | 4–6 (l) |
| Runner-up | 2013.0 | European Championship | Adrian Lewis Category:Articles with hCards | 6–11 (l) |
Question:
Tell me the sum of Year for outcome of runner-up for world darts championship
Answer:
2010.0