Looking for Hong Kong Box Office Records since 1970

[zuozhu]

Hello! I am looking for Hong Kong Box Office Records since 1970 or earliers. I hope to find the ranks and revenues of both the Hong Kong and foreign movies in the Hong Kong Box Office. I saw some people cite HKMDB as a source for that kind of rank. But I couldn't find it after searching this web. Can anyone give me some guidance?

Thanks a LOT!