user: Question: What is Japan's Area km²?
Columns: ['Island', 'Country', 'Population', 'Area km²', 'Density (per km²)']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Santa Cruz del Islote', 'Colombia', '1,247 (2007)', '0.012', '103,917']
SQL:

assistant: SELECT "Area km²" FROM "Table" WHERE "Country" = 'Japan';