user: Question: what is the census ranking when the area km 2 is 173.4?
Columns: ['Official Name', 'Status', 'Area km 2', 'Population', 'Census Ranking']
Types: ['text', 'text', 'real', 'real', 'text']
Sample row: ['Chipman', 'Parish', 482.81, 962.0, '2,135 of 5,008']
SQL:

assistant: SELECT "Census Ranking" FROM "Table" WHERE "Area km 2" = 173.4;