user: Question: How many years had a location at forest hills and a score of 6–3, 6–3 for john mcenroe?
Columns: ['Location', 'Year', 'Champion', 'Runner-up', 'Score']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['Lakeway', 1977.0, 'Harold Solomon', 'Ken Rosewall', '7–6, 6–2, 2–6, 0–6, 6–3']
SQL:

assistant: SELECT COUNT("Year") FROM "Table" WHERE "Location" = 'forest hills' AND "Runner-up" = 'john mcenroe' AND "Score" = '6–3, 6–3';