Returns will vary based on several factors including, how many CHER are staked for a given validator, how much your proportion is in that stake, and how many validators are in the set at a given time. Annual inflation of the CHER supply will not exceed 30%. Rewards from validating is expected to be ~20% annually, assuming no slashing and remaining in the validator set the entire time. Note that only some of the rewards come from supply inflation; other rewards come from transaction fees, tips, and the like. Maximum rewards are obtained when the percentage of all CHERs staked is at 75%.