Here are the weekly manga & light novels rankings for May 14th - 20th.

Ranks/ This week's sales by copies/ Cumulative sales/ Titles
Manga
*1, 315,709 *,788,873 Kimi ni Todoke vol.16
*2, 149,907 *,149,907 Mahou Sensei Negima! vol.38
*3, 131,725 2,821,277 One Piece vol.66
*4, 120,558 *,207,690 Otoyomegatari vol.4
*5, 114,108 *,114,108 Ace of Diamond vol.31
*6, 113,198 *,113,198 Hayate no Gotoku! vol.32 plus vol.0
*7, *82,538 *,237,239 Gantz vol.34
*8, *72,234 *,*72,234 Kingdom vol.26
*9, *60,842 *,*60,842 Capeta vol.28
10, *53,294 1,045,584 Naruto vol.60

11, *44,857 *,*44,857 Bloody Monday Last Season vol.4
12, *39,723 *,*61,158 Zetsuen no Tempest vol.6
13, *37,788 *,*37,788 Eden no Ori vol.17
14, *37,196 *,*37,196 Rozen Maiden vol.7
15, *36,113 *,*36,113 Sayonara Zetsubou Sensei vol.29
16, *35,973 *,202,772 Worst vol.29
17, *35,716 *,*35,716 Hayate no Gotoku! vol.32
18, *34,826 *,108,418 Ane no Kekkon vol.3
19, *32,271 *,104,123 Shaman King Zero vol.1
20, *31,829 *,*31,829 Godhand Teru vol.62

21, *30,457 *,455,203 Bakuman vol.18
22, *30,044 *,*30,044 AKB49 - Renai Kinshi Jourei vol.8
23, *29,745 *,*58,938 Q and A vol.6
24, *29,523 *,*29,523 Gekkou Joureiu vol.18
25, *28,721 *,*28,721 Tobaku Haouden Zero Gyanki-Hen vol.4
26, *28,691 *,*28,691 AKB49 - Renai Kinshi Jourei vol.8 Special Edition
27, *27,924 *,*27,924 Zettai Karen Children vol.30
28, *27,583 *,*27,583 Shigatsu wa Kimi no Uso vol.3
29, *26,424 *,*26,424 Zettai Karen Children vol.30 Limited Edition
30, *25,584 *,*25,584 Kyoukai no RINNE vol.12

Light Novels
*1, 25,285 *85,214 Durarara!! vol.11
*2, 14,811 *14,811 Kore wa Zombie Desu ka? vol.10
*3, 13,159 149,719 Kotenbu series vol.1 Hyouka
*4, 12,730 *12,730 Seitokai no Ichizon fanbook
*5, 11,680 *11,680 Everyday Magic
*6, 10,126 *82,464 Kotenbu series vol.2
*7, *9,906 **9,906 Tokyo Ravens vol.7
*8, *9,389 *32,312 Megu to Seron vol.7
*9, *8,665 **8,665 Ikinari Rapunzel
10, *8,450 *70,843 Kotenbu series vol.3
11, *8,372 755,541 Biblia Koshoten no Jikentecho vol.1
12, *7,909 *91,016 Kotenbu series vol.4

Source: Oricon Youtaiju