CREATE TABLE table_name_96 (year INTEGER, release_air_date VARCHAR(255), role VARCHAR(255), radio_station_production_company VARCHAR(255))
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?
    
SQL: SELECT SUM(year) FROM table_name_96 WHERE role = "narrator" AND radio_station_production_company = "bbc audiobooks" AND release_air_date = "13 november 2008"