user: Question: What is the average year for ponce, puerto rico events?
Columns: ['Year', 'Competition', 'Venue', 'Position', 'Event']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1999.0, 'European Cross Country Championships', 'Velenje , Slovenia', '8th', 'Junior race']
SQL:

assistant: SELECT AVG("Year") FROM "Table" WHERE "Venue" = 'ponce, puerto rico';