http://www.federaltimes.com/article/.../1041/BENEFITS
Since 1998, the percentage of employees in grades 12 to 15 — the highest four grades before reaching the executive ranks — increased from 48 percent to nearly 64 percent.

[It's true where I work, that's partially because we are getting older -- but also our office is half the size it was in 2004. We ARE doing more work per person even if the job description looks the same.]