I have been puzzling like crazy, but I can't find the solution to my problem. Therefore I would like to ask for your help.
I am trying to create a benchmark graph, similar to the one that can be found in the attachment.
In short: It is a bar chart where I would like to compare the value of 1 person to the mean value of the whole group of people. Very simply put. Person A has sold 10 units, Person B has sold 2 units. The mean value of the whole group is 5 units. Therefore Person A has a positive value of +5 and Person B a negative value of -3. I would like to visualize this in a bar chart with positive and negative values.
I someone will be able to explain me how to create such chart.