just to prove what I am saying these are the results scoring formula from the start of 80's
1) 1980 FIA Formula One World Championship
Points for top six finishers (9, 6, 4, 3, 2, 1). Half points awarded for races stopped before half distance. Only the best five scores from the five seven races and the best four scores from the remaining eight races counted towards the championship.
2) 1981 FIA Formula One World Championship
Points for top six finishers (9, 6, 4, 3, 2, 1).
3) 1982 FIA Formula One World Championship
Points for top six finishers (9, 6, 4, 3, 2, 1). Half points awarded for races stopped before half distance.
4) 1983 FIA Formula One World Championship
Points for top six finishers (9, 6, 4, 3, 2, 1). Half points awarded for races stopped before half distance.
5) 1984 FIA Formula One World Championship
Second drivers of teams that officially entered only one car were not eligible for points. This affected Jo Gartner (Osella-alfa Romeo) and Gerhard Berger (ATS-BMW) who finished fifth and sixth at the Italian Grand Prix. Their points were not redistributed. On 18 July, Tyrrell was disqualified from all races so far that season, and banned from competing in remaining races, because the team had run illegal cars.
6) 1985 FIA Formula One World Championship
Points for top six finishers (9, 6, 4, 3, 2, 1). Half points awarded for races stopped before half distance. Best 11 results only counted towards the championship
7) 1986 FIA Formula One World Championship
Points for top six finishers (9, 6, 4, 3, 2, 1). Half points awarded for races stopped before half distance. Best 11 results only counted towards the championship.
8) 1987 FIA Formula One World Championship
Points for top six finishers (9, 6, 4, 3, 2, 1). Half points awarded for races stopped before half distance. Teams which entered only one car, such as Lola, did not score points for their second driver. Best 11 results only counted towards the championship.
9) 1988 FIA Formula One World Championship
Points for top six finishers (9, 6, 4, 3, 2, 1). Half points awarded for races stopped before half distance. Best 11 results only counted towards the championship.
10) 1989 FIA Formula One World Championship
Points for top six finishers (9, 6, 4, 3, 2, 1). Half points awarded for races stopped before half distance. Best 11 results only counted towards the championship.
So now all the above are the rules with their implimentation season mentioned.