user: Question: What year had a 100m freestyle event?
Columns: ['Event', 'Long Course/Short Course', 'Year Set', 'Time', 'Meet']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['100m Freestyle', 'Long Course', 2007.0, '54.08', '2007 FINA World Aquatic Championships']
SQL:

assistant: SELECT "Year Set" FROM "Table" WHERE "Event" = '100m freestyle';