I have charted the User/Producer Index (filled area), along with the annual average and weekly price for corn in Northwest Iowa. This visual provides you with a different look of The Heat Map model at work.
I have identified the User/Producer Index (red highlighted box) on the 2016 corn Heat Map Mode (below). This is what you see on the chart above. The average and weekly price (column 1 below) are included in the chart above.