user: Question: What is the earliest year with a category of Top 10 Selling Mandarin Albums of the Year?
Columns: ['Year', 'Award', 'Category', 'Nomination', 'Result']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2008.0, 'IFPI Hong Kong Album Sales Awards', 'Top 10 Selling Mandarin Albums of the Year', 'Mystery Guest', 'Won']
SQL:

assistant: SELECT MIN("Year") FROM "Table" WHERE "Category" = 'Top 10 Selling Mandarin Albums of the Year';