user: Question: What was the last year that they had less than 16 points in class 500cc?
Columns: ['Year', 'Class', 'Team', 'Points', 'Rank', 'Wins']
Types: ['real', 'text', 'text', 'real', 'text', 'real']
Sample row: [1968.0, '500cc', 'Matchless', 0.0, '–', 0.0]
SQL:

assistant: SELECT MAX("Year") FROM "Table" WHERE "Points" < 16.0 AND "Class" = '500cc';