I found a formula that measures the value using simple math combined with a mechanical drawing. This formula is used to figure lateral loading and unloading of the outside tires versus the inside tires in a turn, to figure how much total loss of traction happens due to uneven loading.
With the ground being perfectly horizontal, the higher you raise the Cg the less input torque required to change the percent of load change.
If you measure at several points, and divide the length of the dashed line by the length of the horizontal line (the radious) we get the answer!
it shows that the first couple of degrees the percent is very close, at 45 degrees it is at the biggest gain per degree, and continuing towards 90 (straight up) it decreases at the same rate it gained by degree.

Having trouble finding the scan . It is on page four of
CHASSIS ENGINEERING by Herb Adams.