Here are the yearly light novels sales rankings for fiscal 2011. (Nov 22nd 2010 - Nov 20th 2011)

Volume by volume
*1, 1,178,421 Moshidora
*2, *,435,124 Suzumiya Haruhi Series vol.10 Limited Edition
*3, *,433,505 Toshokan Sensou vol.1 Small Size Edition
*4, *,305,470 Toshokan Sensou vol.2 Small Size Edition
*5, *,272,524 One Piece Strong Words vol.1
*6, *,258,717 Toshokan Sensou vol.3 Small Size Edition
*7, *,253,748 Baka to Test to Shoukanjuu vol.9
*8, *,251,287 Toaru Majutsu no Index: New Testament vol.2
*9, *,242,360 Toshokan Sensou vol.4 Small Size Edition
10, *,238,712 Boku wa Tomodachi ga Sukunai vol.5
11, *,234,510 Toaru Majutsu no Index: New Testament vol.1
12, *,233,595 Ore no Imouto ga Konnani Kawaii Wake ga Nai vol.8
13, *,220,795 Kabukimonogatari
14, *,214,888 Toshokan Sensou vol.5 Small Size Edition
15, *,208,502 Ore no Imouto ga Konnani Kawaii Wake ga Nai vol.9
16, *,207,104 Boku wa Tomodachi ga Sukunai vol.6
17, *,201,658 Baka to Test to Shoukanjuu vol.9.5

Author by author
*1, 2,927,464 Arikawa Hiro ("Toshokan Sensou")
*2, 1,761,854 Kamachi, Kazuma ("Toaru Majutsu no Index")
*3, 1,445,847 Hirasaka Yomi ("Boku wa Tomodachi ga Sukunai")
*4, 1,257,921 Nisio Isin ("Bakemonogatari")
*5, 1,186,062 Iwasaki Natsumi ("Moshidora")
*6, 1,183,108 Yumizuru, Izuru ("IS: Infinite Stratos")
*7, 1,065,497 Sakuraba Kazuki ("Gosick")
*8, *,960,192 Fushimi Tsukasa ("Ore no Imouto ga Konnani Kawaii Wake ga Nai")
*9, *,957,980 Inoue Kenji ("Baka to Test to Shoukanjuu")
10, *,867,557 Akamatsu Chuugaku ("Hidan no Aria")
11, *,738,925 Kawahara, Reki ("Accel World")
12, *,659,342 Tanigawa Nagaru ("Suzumiya Haruhi Series")
13, *,654,360 Narita, Ryohgo ("Durarara!!")
14, *,646,396 Asano Hajime ("Mayo Chiki!")
15, *,631,252 Iruma Hitoma ("Denpa Onna to Seishun Otoko")
16, *,542,321 Oda Eiichiro ("One Piece")
17, *,519,701 Kaminaga Manabu ("Shinrei Tantei Yakumo")
18, *,495,403 Kimura Shinichi ("Kore wa Zombie Desu ka?")
19, *,452,800 Aoi Sekina ("Seitokai no Ichizon")

Source: Oricon Novel Rankings