How To: Use Pivot Table to Calculate Percentage of YES in specific Column

Hello everyome; thank you for taking your time to check out this problem.

Im a intermediate excel user, been playing with pivot charts. If im using numbers I can make the pivot chart do alot of things, but using the words YES and NO, i just cant figure out.

I have an Excel Sheet.
Basically Looks like:

MEDICAL OFFICE | Region | YEAR & QUARTER | PCP/S |Met Standard?

Under Met Standard there will be a YES or a no.

Now i need to organize the pivot chart in such a way that I can basically see
PER Office what the Percentage of YES Are for a specific appointment type.