user: Question: What is the mean year number where there are more than 0 wins, the class is 250cc, and the points are 95?
Columns: ['Year', 'Class', 'Team', 'Points', 'Wins']
Types: ['real', 'text', 'text', 'real', 'real']
Sample row: [1973.0, '500cc', 'Yamaha', 3.0, 0.0]
SQL:

assistant: SELECT AVG("Year") FROM "Table" WHERE "Wins" > 0.0 AND "Class" = '250cc' AND "Points" = 95.0;