Specific power levels were only stated a few times in the Dragonball Z manga before Akira Toriyama decided it was too difficult to track them and keep them all making sense. Here is a list that shows every time a power level is stated, along with the manga volume number, a relevant quote, and a supporting image (click on the image to see a full-size version in the gallery).
If you would like to discuss power levels in more detail, please head over to our forums.
The previous power levels pages are still available:
Dragonball Z #1 | Dragonball Z #2 | Dragonball GT