user: Question: What is the country of the Representative that left office as Incumbent?
Columns: ['Name', 'Born-Died', 'Took Office', 'Left Office', 'Country']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Sérgio Vieira de Mello', '1948–2003', 'June 1999', 'July 1999', 'Brazil']
SQL:

assistant: SELECT "Country" FROM "Table" WHERE "Left Office" = 'Incumbent';