user: Question: When is the winner Panathinaikos, the runner-up Olympiacos and the venue Nikos Goumas Stadium?
Columns: ['Year', 'Winner', 'Runner-up', 'Score', 'Venue']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['8 June 1947', 'Olympiacos', 'Iraklis', '5–0', 'Apostolos Nikolaidis Stadium']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Winner" = 'Panathinaikos' AND "Runner-up" = 'Olympiacos' AND "Venue" = 'Nikos Goumas Stadium';