To give it a bit more context of how much which series really sold I calculated the backlog numbers for the Top 10 series.
Left are the total sales of all volumes, in the middle are the numbers for the volumes released between november 2017 to november 2018, and right are the backlog numbers.
8,113,317 - 7,211,110 = 902,207 One Piece
6,718,185 - 3,077,303 = 3,640,882 My Hero Academia
5,235,963 - 4,071,280 = 1,164,468 Attack on Titan
Slam Dunk empty, cause everything is backlog
5,030,624 - 4,213,684 = 816,940 Haikyuu!!
4,970,171 - 3,144,815 = 1,825,356 Kingdom
4,867,680 - 2,758,109 = 2,109,571 The Seven Deadly Sins
4,246,955 - 2,099,879 = 2,147,076 The Promised Neverland
3,460,066 - 1,466,159 = 1,993,907 Reincarnated As A Slime
3,267,843 - 2,282,897 = 984,946 Tokyo Ghoul:re