user: Question: What is the average year with an award of Platinum?
Columns: ['Year', 'Date', 'Title', 'Format(s)', 'Award description(s)', 'Result(s)']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1990.0, 'November 27', '"I\'m Your Baby Tonight"', 'Single', 'Gold', 'Won']
SQL:

assistant: SELECT AVG("Year") FROM "Table" WHERE "Award description(s)" = 'Platinum';