percentage of a particular number?

Hi

We have done a questionnaire where people have chosen a particular feedback

I am trying to work out the percentage of feedback per answer

so for example 19 people said very good out of 23 i would like the percentage. The columns show each type of feedback and i need to add those and have the percentage total below

please see attachment to see what i mean. Not sure what i need to do to get the total percentage per column for the type of feedback

thanks