Discussion about hikes in IT sector - How much hike will be given like 10% / 20% / 30%?

Dear CiteHRs, I am Prasanth, and working in a software company. I need your help on the below topic.

1. I would like to know about how IT companies gave hikes to their employees (I mean any grading system / based on reviews / based on projects etc)
2. How much hike will be given like 10% / 20% / 30% (please provide hike doc/grading doc / any parameters etc)? I don't share it with anyone. It would help me a lot. Kindly share it with me.

Please help me.

Sincerely
Prasanth