List the number of active years for attaquant.
CREATE TABLE table_24565004_15 (period VARCHAR, position VARCHAR)
SELECT period FROM table_24565004_15 WHERE position = "Attaquant"
### Context: CREATE TABLE table_24565004_15 (period VARCHAR, position VARCHAR) ### Question: List the number of active years for attaquant. ### Answer: SELECT period FROM table_24565004_15 WHERE position = "Attaquant"