user: Question: Which Returned On has a Year of 2011?
Columns: ['Year', 'Ship', 'Departed From', 'Departed On', 'Returned On']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2010.0, 'Carnival Inspiration', 'Tampa, FL', 'April 29, 2010', 'May 3, 2010']
SQL:

assistant: SELECT "Returned On" FROM "Table" WHERE "Year" = 2011.0;