Season one:June 1974-February 1975
Season two: May 1975-January 1976
Season three: May 1976-February 1977
Season four: May 1977-January 1978
Season five: May 1978-January 1979
Season six: May 1979-January 1980
Season seven: May 1980-January 1981
Season eight: May 1981-January 1982.
