Table: john_williams_motorcyclist_1968
Columns: year
class
team
points
rank
wins

Question: What year did they get 4 points with Suzuki?
SQL: SELECT AVG("year") FROM john_williams_motorcyclist_1968 WHERE "team" = 'suzuki' AND "points" = 4

Question: What was the last year that they had less than 16 points in class 500cc?
SQL: SELECT MAX("year") FROM john_williams_motorcyclist_1968 WHERE "points" < 16 AND "class" = '500cc'