You obviously cant interpret your own data mate...it makes my point for me. Doesn't matter how many/little are scored by all players. It matters that we dont have players behind Lukaku who can weigh in with 8/9 goals.
I agree with Dave here, we definately need a couple of other players to weigh in with ~10 goals a year. Barkley currently on 4 is the best chance, and he's been guilty of a few bad misses this season (has still been great overall for a few months though). Still plenty of time for him to double that tally though.
Other than that you're looking to Lookman/Mirrales and maybe Davies to get more between them.
But this does happen when you've got a striker who slots 20 goals a year, you can become over reliant, and Koeman obviously knows this - hence the Gabbiadini / Befodil(?) links, which didn't happen in the end.
Irrespective of the Rom situation in the summer, a player in here who can throw in a double figure goal return, must be high up on the wanted list.