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At the Trusted User faq page there is a list of all Privileges one can get and how much reputation is required to get that privilege.
At the right side of each privilege, there is a percentage.
trusted user 2%
...
retag questions 100%
...
What does that percentage mean?
It's your progress towards earning that privilege.
For retagging questions, you've already reached the required reputation, but for trusted user you only have 2% of the required reputation.
The percentages indicate how close you are, based on reputation, to achieving those privileges. Those at 100% indicate privileges that you've already been granted.
