user: Question: What is the earliest year the New York Jets won at Harvard Stadium?
Columns: ['Year', 'Date', 'Winner', 'Result', 'Loser', 'Location']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1970.0, 'September 27', 'New York Jets', '31–21', 'Boston Patriots', 'Harvard Stadium']
SQL:

assistant: SELECT MIN("Year") FROM "Table" WHERE "Winner" = 'New York Jets' AND "Location" = 'Harvard Stadium';