user: Question: What nations participated in 2007?
Columns: ['Sport', 'Body', 'Year', 'Event type', 'Location', 'Nations']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Aquathlon', 'CMAS', '2009', 'World Cup', 'Not known', 'Not known']
SQL:

assistant: SELECT "Nations" FROM "Table" WHERE "Year" = '2007';