I'd also agree that Salah's performance has not dropped. And the data bears this out. Looking at his year-by-year stats playing for Liverpool, his figures for the current season (as stated above by skarais, 23 goals and 13 assists) are excellent, and in no way worse than previous seasons.
[img width=600]https://i.imgur.com/5nqhWDc.jpg[/img]
For anyone who says Salah's performance has decreased, they are completely unaware that Salah has managed to set a fantastic record this season. Salah manages to score 20+ goals every season
[based on stats on the pictures you posted] across various competitions for Liverpool but if one only sees him in one game especially when he doesn't score then he probably doesn't know much about Salah.
But for next season, I hope he will not be too affected by the possibility of Mane moving to another team. Salah remains Liverpool's most important player next season and I hope he can maintain his good record again.