user: Question: What's the lowest Year with a  Venue of Casablanca and has the Time of 20.63w?
Columns: ['Year', 'Competition', 'Venue', 'Position', 'Event', 'Time']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1983.0, 'World Championships', 'Helsinki', '2nd', '4x100 m relay', '38.37']
SQL:

assistant: SELECT MIN("Year") FROM "Table" WHERE "Venue" = 'Casablanca' AND "Time" = '20.63w';