This is a percentile ranking in an ascending manner. The lowest value (in %) will appear at the top and the highest value (in %) will always at the bottome. For the color logic - the lowest value will always be in the darkest RED shade reducing to light red, then amber, then yellow, then light green and then dark green for the highest value. In short, the lowest value on the top will always be in dark red color and then it gets lighter and becomes green as the values increase.
