user: Question: What year has a decile more than 6, in the Waikouaiti area?
Columns: ['Name', 'Years', 'Gender', 'Area', 'Authority', 'Decile', 'Roll']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Ardgowan School', '1–8', 'Coed', 'Oamaru', 'State', 7.0, 121.0]
SQL:

assistant: SELECT "Years" FROM "Table" WHERE "Decile" > 6.0 AND "Area" = 'Waikouaiti';