Hive inflation is the amount of Hive that is printed each year. It is somewhere around 8% right now.
All Hive that is powered up receives adjustments to compensate somewhat for that. It is not a great amount, hence why the numbers or small.
If memory is correct, it works out to be about 3% annually.
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Sorry, but I guess the part of the Hive inflation that is to be counted as earnings from staking Hive is much less than 8%, a part of the newly printed Hive goes to the proposal system and to the reward pool. It is more around 2-3%.