user: Question: Role of Narrator, and a Radio Station/Production Company of BBC Audiobooks, and a Release/Air Date of 13 November 2008 is what sum of the year?
Columns: ['Year', 'Role', 'Author', 'Radio Station/Production Company', 'Release/Air Date']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1976.0, 'Sarah Jane Smith', 'Bernard Venables', 'BBC Radio 4', '4 October 1976']
SQL:

assistant: SELECT SUM("Year") FROM "Table" WHERE "Role" = 'Narrator' AND "Radio Station/Production Company" = 'BBC Audiobooks' AND "Release/Air Date" = '13 November 2008';