user: Question: What is Year (Ceremony), when Director is "Wang Siu-di"?
Columns: ['Year (Ceremony)', 'Film title used in nomination', 'Original title', 'Director', 'Result']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1957 (30th)', 'Amina', 'Amina (阿美娜)', 'Yuan Congmei', 'Not Nominated']
SQL:

assistant: SELECT "Year (Ceremony)" FROM "Table" WHERE "Director" = 'Wang Siu-di';