user: Question: How many networks aired the franchise in 1981 only?
Columns: ['Region/Country', 'Local name', 'Network', 'Dates aired', 'Starring']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['United Kingdom', 'Till Death Us Do Part', 'BBC One', '1965–1968, 1970, 1972–1975', 'Warren Mitchell as Alf Garnett']
SQL:

assistant: SELECT COUNT("Network") FROM "Table" WHERE "Dates aired" = '1981';