1) It should display a Heading identifying the Field Name Selected like Statistics Chart Grouped by Rating 2) No matter what field is selected the media field is always displayed at the bottom separated into 15 groups as a percentage that adds up to way more than 100%. 3) It would be better to separate the number with a ' = ' (space equal space) because the single space isn't enough separation between the description and the number.
By the way... "Not assigned: 800,00%"??? These numbers looks a little confusing to me. I guess it would be better if all movies were counted as 100% and the media types would be shown like "DIVX5: 56 (5,2%)".