Here Oricon Manga sales from November 20, 2017 to November 18, 2018.
Top 10 Best Selling Manga Series 2018
https://www.oricon.co.jp/confidence/special/52166/7/
1 - One Piece (8,113,317 copies).
2 - Boku no Hero Academia (6,718,185 copies).
3 - Shingeki no Kyojin (5,235,963 copies).
4 - Slam Dunk (5,214,085 copies).
5 - Haikyû!! (5,030,624 copies).
6 - Kingdom (4,970,171 copies).
7 - Nanatsu no Taizai (4,867,680 copies).
8 - The Promised Neverland (4,246,955 copies).
9 - Tensei Shitara Slime Datta Ken (3,460,066 copies).
10 - Tokyo Ghoul:re (3,267,843 copies).
Top 10 Best Selling Manga Volumes 2018
https://www.oricon.co.jp/confidence/special/52166/5/
https://www.oricon.co.jp/confidence/special/52166/6/
1 - One Piece 88 (2,476,305 copies).
2 - One Piece 89 (2,167,146 copies).
3 - One Piece 90 (2,074,623 copies).
4 - Shingeki no Kyojin 24 (1,486,038 copies).
5 - Shingeki no Kyojin 25 (1,358,623 copies).
6 - Shingeki no Kyojin 26 (1,226,619 copies).
7 - Hunter x Hunter 35 (1,090,958 copies).
8 - Hunter x Hunter 36 (892,834 copies).
9 - Kingdom 50 (846,414 copies).
10 - Kingdom 49 (845,862 copies).
.
.
.
47 - One Piece 80 ( copies).
Last year sales: http://www.arlongpark.net/showthread.php?t=48301