Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_41 (year INTEGER, outcome VARCHAR, championship VARCHAR)
### Question:
Tell me the sum of Year for outcome of runner-up for world darts championship
### Answer:
SELECT SUM(year) FROM table_name_41 WHERE outcome = "runner-up" AND championship = "world darts championship"