Some thoughts on our next visitation project:
Fill the area of the woman/ man shape to show percentages, this is double use of data ink proving data which is also a label.
However will almost certainly need a line are faded color to show the rest of the male female shape to allow an idea of the percentage to be gained.
Use only half male/female shapes to reduce duplication, and allow easier comparison
possibly reinforce the heights with a black line, this is a waste of ink, and is duplication but I believe it will aid in visual pop-out.
For anyone reading this wants to know more about graphics I would recommend