This was posted on 2ch:
Morning Musume single sales in Taiwan
438,700 Happy Summer Wedding
395,200 I WISH
391,800 Renai Revolution 21
349,200 The Peace!
312,400 Mr. Moonlight ~Ai no Big Band~
243,800 Souda! We're ALIVE
211,600 Do it! Now
223,200 Koko ni Iruzee!
227,600 Morning Musume no Hyokkori Hyoutanjima
225,800 AS FOR ONE DAY
155,800 Shabondama
143,500 Go Girl ~Koi no Victory~
136,500 Ai Araba IT'S ALL RIGHT
132,300 Roman ~MY DEAR BOY~
137,300 Joshi Kashimashi Monogatari
132,000 Namida ga Tomaranai Houkago
116,600 THE Manpower!!!
110,100 Osaka Koi no Uta
*97,300 Iroppoi Jirettai
*86,600 Chokkan 2 ~Nogashita Sakana wa Ookiizo!~
*92,500 SEXY BOY ~Soyokaze ni Yorisotte~
*91,700 Ambitious! Yashinteki de Ii Jan
*85,900 Aruiteru
*78,700 Egao YES Nude
*84,200 Kanashimi Twilight
*85,800 Onna ni Sachi Are
(Investigated by Nikkei Entertainment)
These sales are quite high if you consider Japan's population is five times as large as Taiwan's.