Season 1

1976-11-01

Season 2

1978-03-07

Season 3

1979-08-09

Season 4

1980-04-17

Season 5

1981-06-11

Season 6

1982-01-07

Season 7

1983-01-04

Season 8

1984-02-14

Season 9

1986-09-04

Season 10

1988-02-11

Season 11

1989-03-23

Season 12

1990-02-22

Season 13

1991-09-03

Season 14

1992-01-21

Season 15

1994-05-17

Season 16

2007-12-12

Season 17

2008-01-16

Season 18

2009-01-07

Season 19

2010-01-13

Season 20

2011-01-12