In what year did 'Magnum, P.I.' premiere?

In what year did 'The Dukes of Hazzard' premiere? Where is 'The Dukes of Hazzard' set? Who created 'The Dukes of Hazzard'? On which network did 'Magnum, P.I.' originally air? On which network did 'Hill Street Blues' originally air? In what year did 'Hill Street Blues' premiere? Who created 'Hill Street Blues'? On which network did 'Knight Rider' originally air?