64 times a player has scored 20+ goals in the PL in 24 seasons. Henry(5), Shearer (7), Van Nistelrooy (4), Aguero, Ferdinand(3) and RVP, Fowler, JFH, Kane, Drogba, Suarez, Wright, Rooney (2). These players make up nearly 50% of the times it's happened.
20 a season is what fans of Top 4 sides want of their £30m+ strikers.