user: Question: What is the average year in which the finish position was 13th?
Columns: ['Year', 'Competition', 'Venue', 'Position', 'Notes']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2005.0, 'World Youth Championships', 'Marrakesh , Morocco', '25th', '39.34 m']
SQL:

assistant: SELECT AVG("Year") FROM "Table" WHERE "Position" = '13th';