user: Question: What is the average win as a percentage of german racer rudi altig, who has ridden in over 79 races?
Columns: ['Name', 'Nationality', 'Races won', 'Races ridden', 'Win average']
Types: ['text', 'text', 'real', 'real', 'real']
Sample row: ['Patrick Sercu', 'Belgian', 88.0, 223.0, 0.3946]
SQL:

assistant: SELECT AVG("Win average") FROM "Table" WHERE "Nationality" = 'german' AND "Name" = 'rudi altig' AND "Races ridden" > 79.0;