Here Oricon Manga sales from November 18, 2013 to November 16, 2014.
Top 10 Best Selling Manga Series 2014
1 - One Piece (11,885,957 copies)
2 - Shingeki no Kyojin (11,728,368 copies)
3 - Haikyû!! (8,283,709 copies)
4 - Tokyo Ghoul (6,946,203 copies)
5 - Kuroko no Basket (6,729,439 copies)
6 - Naruto (5,505,179 copies)
7 - Daiya no Ace (4,681,031 copies)
8 - Magi (4,657,971 copies)
9 - Nanatsu no Taizai (4,633,246 copies)
10 - Assassination Classroom (4,622,108 copies)
http://www.oricon.co.jp/entertainment/ranking/2014/bookrank1201/index06.html
Top 50 Highest Selling Manga Volumes 2014
1 - One Piece 73 (3,010,801 copies)
2 - One Piece 74 (2,834,558 copies)
3 - One Piece 75 (2,698,071 copies)
4 - Shingeki no Kyojin 13 (1,921,457 copies)
5 - Shingeki no Kyojin 12 (1,895,305 copies)
6 - Shingeki no Kyojin 14 (1,773,871 copies)
7 - Naruto 67 (1,106,651 copies)
8 - Naruto 68 (1,098,121 copies)
9 - Kimi ni Todoke 21 (1,031,380 copies)
10 - Naruto 69 (1,007,954 copies)
http://www.oricon.co.jp/entertainment/ranking/2014/bookrank1201/index05.html
http://www.oricon.co.jp/entertainment/ranking/2014/bookrank1201/index05_1.html
Remember, One Piece only had 3 new Volumes in 2014 (73, 74 and 75) becouse of Oda's surgery. With 4 Volumes like last years, we should add 2,500,000 copies more.