The percentage of increment depends on various factors. The important ones are the payable capacity, increase in the cost of living, talent availability, percentage across the similar industry, market trend, performance of the company, and individual.
These factors are general, and you must also take care of critical people and departments. In general, the management will declare the budget, and based on the amount available, a plan will be formulated accordingly. It is essential to involve all Heads of Departments in finalizing the percentage of increment for departments and individuals; otherwise, they may simply shift the blame to HR.
Regards,
Kamesh