He actually had 20. 12 in league, 5 in CL, 2 in Coppa, 1 in Supercopa. 20... in 43 appearances or 3060' of playing time. A goal ratio of 1 to every 153 minutes which is excellent.
Of course it's great, and I think he's gonna do quite good here as well, but just a tad bit worse in terms of goals. Obviously it mostly depends on how much he really plays, but I'd expect him to score around 12-14 in Serie A and 18-20 as a whole.