CREATE TABLE table_name_17 (season VARCHAR(255), races VARCHAR(255), points VARCHAR(255), percentage_of_possible_points VARCHAR(255))
Which season with 16 races had less than 321 points and a larger percent than 65.78 possible?
    
SQL: SELECT season FROM table_name_17 WHERE points < 321 AND percentage_of_possible_points > 65.78 AND races = 16