user: Question: What's the lowest Year with a World Rank of 5th, with a Result greater than 20.31?
Columns: ['Year', 'Result', 'World Rank', 'Location', 'Date']
Types: ['real', 'real', 'text', 'text', 'text']
Sample row: [1972.0, 20.2, '3rd', 'El Paso', 'Apr 15']
SQL:

assistant: SELECT MIN("Year") FROM "Table" WHERE "World Rank" = '5th' AND "Result" > 20.31;