user: Question: What was the Gdp (bn) for the region that has Ioannina as its Capital?
Columns: ['Region', 'Capital', 'Area (km²)', 'Area (sq. mi.)', 'Population', 'GDP ( bn )']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Attica', 'Athens', '3,808', '1,470', '3,812,330', '€103.334']
SQL:

assistant: SELECT "GDP ( bn )" FROM "Table" WHERE "Capital" = 'Ioannina';