well, normal is relative to how the engine was driven to this point. I would expect that a well treated engine would have very similar compression ratings between 75K and 127K. Your readings indicate that the engine is losing some of its efficiency (or has lost some of it). However the fact that the readings for each cylinder are so close is really most important...as it shows there isn't a failure happening, just gradual wear. I have a Ford truck that the engine compression should be 180, but it is between 90 and 120 depending on which cylinder...it still runs fine and doesn't burn much oil (though power isn't that great any more and I run 15W-40). With proper engine treatment (oil changes, not beating on it) this engine could last another 127K and not have much compression loss at all. You may want to consider running a slightly higher viscosity oil going forward as it will help reduce oil burning and improve compression/efficiency. Unless the car is running poorly, can't pass emissions testing, or is consuming way to much oil, I wouldn't even consider a ring job at this point. And BTW, if your rings are worn, generally so are your valves, bearings, etc...