user: Question: What is the average year with Alfredo Salazar Fina Salazar in mixed doubles?
Columns: ['Year', "Men's singles", "Women's singles", "Men's doubles", "Women's doubles", 'Mixed doubles']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1965.0, 'Otto Hecker', 'Peggy Brixhe', 'Fernando Pinto Vitor P. Alves', 'Isabel Salema Peggy Brixhe', 'Fernando Pinto Peggy Brixhe']
SQL:

assistant: SELECT AVG("Year") FROM "Table" WHERE "Mixed doubles" = 'Alfredo Salazar Fina Salazar';