resource_state_bytes is an important factor for the RC costs of a vote and a comment.
It can be seen that the comment costs are stable now:
Also the costs for a vote are stabilized now:
The resource_history_bytes pool influences the costs of all operation.
Transfer and custom_json operations are mainly determined by the resource_history_bytes pool. Thus they keep falling:
The resource_market_bytes pool influences all market operation (e.g. transfer).
The resource_new_accounts influences the claim account creation operation costs.