I wouldn't put much faith in a % bid and I definitely wouldn't be measuring with a micrometer. Categories have to potential to go up and down in size pretty fast around here. My category peaked in size on the AE I was awarded it, and has decreased ~30% in the last 2-3 years. I've only recently gotten back to my original relative seniority. A good friend just bid over to Captain and a few months later they announced their plans have changed and his category will be decreasing in size. It's all a crapshoot.