user: Question: Which Year Left is the highest one that has a Location of East Chicago, and a Year Joined of 1969, and a School of East Chicago Roosevelt?
Columns: ['School', 'Location', 'Mascot', 'County', 'Year Joined', 'Previous Conference', 'Year Left', 'Conference Joined']
Types: ['text', 'text', 'text', 'text', 'real', 'text', 'real', 'text']
Sample row: ['Hammond Clark', 'Hammond', 'Pioneers', '45 Lake', 1969.0, 'Northwestern', 2007.0, 'Great Lakes']
SQL:

assistant: SELECT MAX("Year Left") FROM "Table" WHERE "Location" = 'East Chicago' AND "Year Joined" = 1969.0 AND "School" = 'East Chicago Roosevelt';