Actually there is no any such criteria for each webpage of backlinks. Try to generate more backlink from quality source for your website with targeted business keywords.
Quality is important than quantity. You should not focus on number of backlinks. Build only high quality backlinks, low quality links are of no use for improving ranking.
Follow the High pr Sites below strategies to effective back link for better ranking,
Article submission
Social bookmarking submission
Directory submission
Blog Commenting
Classified submission
No one can tell you exact backlink count needed for each webpage. Actually quantity is not important quality is important. Build quality backlinks from high authority sites which will help you to boost your ranking.