user: Question: What year was the Mercury City Tower?
Columns: ['Continent', 'Structure', 'Height', 'Year', 'Country']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['Asia', 'Burj Khalifa', 'm (ft)', 2009.0, 'United Arab Emirates']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Structure" = 'Mercury City Tower';