This function works the same as the create_contest_bar function creating a simple bar to display the contest between two different values although this time with percentages instead of the actual number. It is particularly ideal for comparing time values which are often in the unit of seconds which is less visually effective as a large number.
Basic format: "content_name": ["create_possession_bar", "content_title", "success_value", "failure_value", "location_id", "width", "height", ["colour1", "colour2"] , "href_link"]
e.g: "contest_possession": ["create_possession_bar", "Possession", "clip_total", "clip_total", "#A2", "", 30]