What is the percentage of each color in a bag of Skittles?

To properly answer your question. In a bag of Skittles, according to the Skittles website in 2002, the colors were arranged like this; Green: 19.7%, Yellow: 19.5%, Orange: 20.2%, Red: 20%, and Purple: 20.6%.

More information can be found in the related link which is also the source of the above data.