user: Question: Notre-Dame-de-Lourdes has what average area km 2?
Columns: ['Official Name', 'Status', 'Area km 2', 'Population', 'Census Ranking']
Types: ['text', 'text', 'real', 'real', 'text']
Sample row: ['Saint-Joseph', 'Parish', 321.87, 1696.0, '1,472 of 5,008']
SQL:

assistant: SELECT AVG("Area km 2") FROM "Table" WHERE "Official Name" = 'Notre-Dame-de-Lourdes';