SELECT "Year" FROM table_73494 WHERE "Opponent in the final" = 'John McEnroe' AND "Championship" = 'Wimbledon'
What is every year where opponent in the final is John Mcenroe at Wimbledon?
CREATE TABLE table_73494 (
    "Outcome" text,
    "Year" real,
    "Championship" text,
    "Surface" text,
    "Opponent in the final" text,
    "Score in the final" text
)