Well, different companies have different formula in calculating the pay adjustment.
For those, who is not aware, I'm just giving a general overview.
But for sure, experience staff might not receive their due recognition in term of comparing pay to a fresh grad, unless they are extremely valuable to the company.
if you have been communicating effectively with your superiors and HR, I'm sure they will value your services, however, if your company is only interested in hiring fresh grads, then I think that position really does not need much special requirements.
The cost of training a staff is costly and usually will take anywhere between 3 to 9months before he/she can contribute back to the company.
Also to note that it is only cost effective if the staff hired will enable the company to earn at least 3 times his given salary.