Yeah ive gotta explain myself a bit better.
The % is the Win & place added up together
divided by the number of total runs, seems to work so i'll stick with it.

So example;
Total Number of runs. 26
Total Number of wins. 4
Total Number of places. 5
Win, Places =9
9/26 =0.346 *100 = 34.6%

Simple idea has some good days????