I was surprised by the % being included as I figured that would be decided by the board at the time a divindend is approved. I have no idea why a % which would be defined before knowing the details of the companies financial situation.

I wonder if this is more of a protection against the board deciding on a dividend when it is in the best interest in the near term for the company to keep money in the bank. So defining 6% might mean "this company has so much cash that they can return a 6% dividend without harming the long-term potential". Perhaps if you aren't able to return 6%, you aren't ready to return a dividend at all?