user: Question: What is every year where opponent in the final is John McEnroe at Wimbledon?
Columns: ['Outcome', 'Year', 'Championship', 'Surface', 'Opponent in the final', 'Score in the final']
Types: ['text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['Winner', 1974.0, 'French Open', 'Clay', 'Manuel Orantes', '2–6, 6–7 (1–7) , 6–0, 6–1, 6–1']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Opponent in the final" = 'John McEnroe' AND "Championship" = 'Wimbledon';