user: Question: What's the average year for the accolade 100 Greatest Singles of All Time?
Columns: ['Year', 'Publication', 'Country', 'Accolade', 'Rank']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1993.0, 'Rolling Stone', 'United States', 'Top 100 Music Videos', 84.0]
SQL:

assistant: SELECT AVG("Year") FROM "Table" WHERE "Accolade" = '100 Greatest Singles of All Time';