user: Question: What is the average finish that has 24 as the start, with a year after 1987?
Columns: ['Year', 'Chassis', 'Engine', 'Start', 'Finish', 'Entrant']
Types: ['real', 'text', 'text', 'real', 'real', 'text']
Sample row: [1981.0, 'Phoenix 80', 'Ford Cosworth DFX', 12.0, 4.0, "Jerry O'Connell Racing"]
SQL:

assistant: SELECT AVG("Finish") FROM "Table" WHERE "Start" = 24.0 AND "Year" > 1987.0;