Currently, in a Careers profile we have "Top 10% in Tag XY". This is nice, but I think it would be even better to display that value not for "All time", but only for the last 30 (or 60 or 90) days. I believe, the recent activity is even more interesting to others.
I can't say I really understand where you're coming from. You certainly wouldn't say that about the employment or education sections of the profile so I don't know why it would apply here or what makes it more interesting.